diff --git a/search-service/src/main/kotlin/com/egm/stellio/search/model/TemporalEntitiesQuery.kt b/search-service/src/main/kotlin/com/egm/stellio/search/model/TemporalEntitiesQuery.kt
index a3d04dde6..6063f3a10 100644
--- a/search-service/src/main/kotlin/com/egm/stellio/search/model/TemporalEntitiesQuery.kt
+++ b/search-service/src/main/kotlin/com/egm/stellio/search/model/TemporalEntitiesQuery.kt
@@ -1,5 +1,9 @@
 package com.egm.stellio.search.model
 
+import java.time.Duration
+import java.time.Period
+import java.time.temporal.TemporalAmount
+
 data class TemporalEntitiesQuery(
     val entitiesQuery: EntitiesQuery,
     val temporalQuery: TemporalQuery,
@@ -10,4 +14,16 @@ data class TemporalEntitiesQuery(
     fun isAggregatedWithDefinedDuration(): Boolean =
         withAggregatedValues &&
             (temporalQuery.aggrPeriodDuration != null && temporalQuery.aggrPeriodDuration != "PT0S")
+
+    fun computeAggrPeriodDuration(): TemporalAmount {
+        val splitted = temporalQuery.aggrPeriodDuration!!.split("T")
+        return if (splitted.size == 1) // has only date-based fields
+            Period.parse(temporalQuery.aggrPeriodDuration)
+        else {
+            val duration = Duration.parse("PT" + splitted[1])
+            if ("P" == splitted[0]) // has only time-based fields
+                duration
+            else Period.parse(splitted[0]).plus(duration)
+        }
+    }
 }
diff --git a/search-service/src/main/kotlin/com/egm/stellio/search/scope/ScopeService.kt b/search-service/src/main/kotlin/com/egm/stellio/search/scope/ScopeService.kt
index 95d3753be..6badab4f6 100644
--- a/search-service/src/main/kotlin/com/egm/stellio/search/scope/ScopeService.kt
+++ b/search-service/src/main/kotlin/com/egm/stellio/search/scope/ScopeService.kt
@@ -177,7 +177,7 @@ class ScopeService(
             )
             .bind("entity_id", entityId)
             .bind("time_property", timeproperty.name)
-            .oneToResult { toZonedDateTime(it["first"]) }
+            .oneToResult { toOptionalZonedDateTime(it["first"]) }
             .getOrNull()
 
     private fun Json.replaceScopeValue(newScopeValue: Any): Map<String, Any> =
diff --git a/search-service/src/main/kotlin/com/egm/stellio/search/service/AttributeInstanceService.kt b/search-service/src/main/kotlin/com/egm/stellio/search/service/AttributeInstanceService.kt
index 10cd1582c..f1d5831d1 100644
--- a/search-service/src/main/kotlin/com/egm/stellio/search/service/AttributeInstanceService.kt
+++ b/search-service/src/main/kotlin/com/egm/stellio/search/service/AttributeInstanceService.kt
@@ -18,7 +18,6 @@ import org.springframework.r2dbc.core.bind
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
 import java.net.URI
-import java.time.Duration
 import java.time.ZonedDateTime
 import java.util.UUID
 
@@ -174,7 +173,11 @@ class AttributeInstanceService(
                 this.allToMappedList { rowToAttributeInstanceResult(it, temporalEntitiesQuery) }
             }.fold(
                 { it.right() },
-                { OperationNotSupportedException(INCONSISTENT_VALUES_IN_AGGREGATION_MESSAGE).left() }
+                {
+                    OperationNotSupportedException(
+                        it.cause?.message ?: INCONSISTENT_VALUES_IN_AGGREGATION_MESSAGE
+                    ).left()
+                }
             )
     }
 
@@ -275,7 +278,7 @@ class AttributeInstanceService(
                 if (!temporalEntitiesQuery.isAggregatedWithDefinedDuration())
                     toZonedDateTime(row["endTime"])
                 else
-                    startDateTime.plus(Duration.parse(temporalEntitiesQuery.temporalQuery.aggrPeriodDuration))
+                    startDateTime.plus(temporalEntitiesQuery.computeAggrPeriodDuration())
             // in a row, there is the result for each requested aggregation method
             val values = temporalEntitiesQuery.temporalQuery.aggrMethods!!.map {
                 val value = row["${it.method}_value"] ?: ""
diff --git a/search-service/src/test/kotlin/com/egm/stellio/search/service/AggregatedQueryServiceTests.kt b/search-service/src/test/kotlin/com/egm/stellio/search/service/AggregatedQueryServiceTests.kt
index e72acf9bc..ea80463b1 100644
--- a/search-service/src/test/kotlin/com/egm/stellio/search/service/AggregatedQueryServiceTests.kt
+++ b/search-service/src/test/kotlin/com/egm/stellio/search/service/AggregatedQueryServiceTests.kt
@@ -349,7 +349,7 @@ class AggregatedQueryServiceTests : WithTimescaleContainer, WithKafkaContainer {
     }
 
     @Test
-    fun `ìt should aggregate on the whole time range if no aggrPeriodDuration is given`() = runTest {
+    fun `it should aggregate on the whole time range if no aggrPeriodDuration is given`() = runTest {
         val temporalEntityAttribute = createTemporalEntityAttribute(TemporalEntityAttribute.AttributeValueType.NUMBER)
         (1..10).forEach { i ->
             val attributeInstance = gimmeAttributeInstance(teaUuid)
@@ -372,6 +372,35 @@ class AggregatedQueryServiceTests : WithTimescaleContainer, WithKafkaContainer {
         }
     }
 
+    @ParameterizedTest
+    @CsvSource(
+        "P1D, 10",
+        "PT48H, 6",
+        "PT24H, 10",
+        "PT12H, 10",
+        "P1W, 2",
+        "P2W, 1",
+        "P1M, 2"
+    )
+    fun `it should aggregate on the asked aggrPeriodDuration`(
+        aggrPeriodDuration: String,
+        expectedNumberOfBuckets: Int
+    ) = runTest {
+        val temporalEntityAttribute = createTemporalEntityAttribute(TemporalEntityAttribute.AttributeValueType.NUMBER)
+        val startTimestamp = ZonedDateTime.parse("2023-12-28T12:00:00Z")
+        (1..10).forEach { i ->
+            val attributeInstance = gimmeAttributeInstance(teaUuid)
+                .copy(time = startTimestamp.plusDays(i.toLong()))
+            attributeInstanceService.create(attributeInstance)
+        }
+
+        val temporalEntitiesQuery = createTemporalEntitiesQuery("avg", aggrPeriodDuration)
+        attributeInstanceService.search(temporalEntitiesQuery, temporalEntityAttribute, startTimestamp)
+            .shouldSucceedWith { results ->
+                assertEquals(expectedNumberOfBuckets, results.size)
+            }
+    }
+
     @Test
     fun `it should handle aggregates for an attribute having different types of values in history`() = runTest {
         val temporalEntityAttribute = createTemporalEntityAttribute(TemporalEntityAttribute.AttributeValueType.ARRAY)
@@ -388,7 +417,7 @@ class AggregatedQueryServiceTests : WithTimescaleContainer, WithKafkaContainer {
         attributeInstanceService.search(temporalEntitiesQuery, temporalEntityAttribute, now)
             .shouldFail {
                 assertInstanceOf(OperationNotSupportedException::class.java, it)
-                assertEquals(INCONSISTENT_VALUES_IN_AGGREGATION_MESSAGE, it.message)
+                assertEquals("cannot get array length of a scalar", it.message)
             }
     }
 
@@ -407,12 +436,15 @@ class AggregatedQueryServiceTests : WithTimescaleContainer, WithKafkaContainer {
         return temporalEntityAttribute
     }
 
-    private fun createTemporalEntitiesQuery(aggrMethod: String): TemporalEntitiesQuery =
+    private fun createTemporalEntitiesQuery(
+        aggrMethod: String,
+        aggrPeriodDuration: String = "P1D"
+    ): TemporalEntitiesQuery =
         gimmeTemporalEntitiesQuery(
             TemporalQuery(
                 timerel = TemporalQuery.Timerel.AFTER,
                 timeAt = now.minusHours(1),
-                aggrPeriodDuration = "P1D",
+                aggrPeriodDuration = aggrPeriodDuration,
                 aggrMethods = listOfNotNull(TemporalQuery.Aggregate.forMethod(aggrMethod))
             ),
             withAggregatedValues = true
diff --git a/shared/src/main/kotlin/com/egm/stellio/shared/util/ApiResponses.kt b/shared/src/main/kotlin/com/egm/stellio/shared/util/ApiResponses.kt
index 09612a8dd..b2ef5c67f 100644
--- a/shared/src/main/kotlin/com/egm/stellio/shared/util/ApiResponses.kt
+++ b/shared/src/main/kotlin/com/egm/stellio/shared/util/ApiResponses.kt
@@ -76,6 +76,8 @@ fun APIException.toErrorResponse(): ResponseEntity<*> =
             generateErrorResponse(HttpStatus.BAD_REQUEST, InvalidRequestResponse(this.message))
         is BadRequestDataException ->
             generateErrorResponse(HttpStatus.BAD_REQUEST, BadRequestDataResponse(this.message))
+        is OperationNotSupportedException ->
+            generateErrorResponse(HttpStatus.BAD_REQUEST, OperationNotSupportedResponse(this.message))
         is AccessDeniedException ->
             generateErrorResponse(HttpStatus.FORBIDDEN, AccessDeniedResponse(this.message))
         is NotImplementedException ->