diff --git a/buildSrc/src/main/kotlin/Versions.kt b/buildSrc/src/main/kotlin/Versions.kt
index 3f84278c..6b5a3557 100644
--- a/buildSrc/src/main/kotlin/Versions.kt
+++ b/buildSrc/src/main/kotlin/Versions.kt
@@ -1,6 +1,6 @@
 @Suppress("ConstPropertyName", "MemberVisibilityCanBePrivate")
 object Versions {
-    const val project = "0.5.3-SNAPSHOT"
+    const val project = "0.5.3"
 
     const val java = 17
     const val kotlin = "1.9.22"
diff --git a/kafka-connect-oura-source/src/main/java/org/radarbase/connect/rest/oura/OuraSourceTask.java b/kafka-connect-oura-source/src/main/java/org/radarbase/connect/rest/oura/OuraSourceTask.java
index 293a792f..39ad35e7 100644
--- a/kafka-connect-oura-source/src/main/java/org/radarbase/connect/rest/oura/OuraSourceTask.java
+++ b/kafka-connect-oura-source/src/main/java/org/radarbase/connect/rest/oura/OuraSourceTask.java
@@ -63,6 +63,7 @@ public class OuraSourceTask extends SourceTask {
   private AvroData avroData = new AvroData(20);
   private KafkaOffsetManager offsetManager;
   String TIMESTAMP_OFFSET_KEY = "timestamp";
+  long TIMEOUT = 60000L;
 
   public void initialize(OuraRestSourceConnectorConfig config, OffsetStorageReader offsetStorageReader) {
     OuraRestSourceConnectorConfig ouraConfig = (OuraRestSourceConnectorConfig) config;
@@ -144,6 +145,8 @@ public List<SourceRecord> poll() throws InterruptedException {
     List<SourceRecord> sourceRecords = Collections.emptyList();
 
     do {
+      Thread.sleep(TIMEOUT);
+
       Map<String, String> configs = context.configs();
       Iterator<? extends RestRequest> requestIterator = this.requests()
           .iterator();
diff --git a/oura-library/src/main/kotlin/org/radarbase/oura/request/OuraRequestGenerator.kt b/oura-library/src/main/kotlin/org/radarbase/oura/request/OuraRequestGenerator.kt
index d948d874..6d35132e 100644
--- a/oura-library/src/main/kotlin/org/radarbase/oura/request/OuraRequestGenerator.kt
+++ b/oura-library/src/main/kotlin/org/radarbase/oura/request/OuraRequestGenerator.kt
@@ -89,10 +89,9 @@ constructor(
                 logger.info("Offsets found in persistence: " + offsetTime.toString())
                 offsetTime.coerceAtLeast(startDate)
             }
-        val endDate = if (user.endDate >= Instant.now()) Instant.now() else user.endDate
+        val endDate = user.endDate?.coerceAtMost(Instant.now()) ?: Instant.now()
         if (Duration.between(startOffset, endDate) <= ONE_DAY) {
-            logger.info("Interval between dates is too short. Backing off..")
-            userNextRequest[user.versionedId] = Instant.now().plus(USER_BACK_OFF_TIME)
+            logger.info("Interval between dates is too short. Not requesting..")
             return emptySequence()
         }
         val endTime = (startOffset + defaultQueryRange).coerceAtMost(endDate)
@@ -130,19 +129,12 @@ constructor(
             ouraOffsetManager.updateOffsets(
                 request.route,
                 request.user,
-                Instant.ofEpochSecond(offset).plus(Duration.ofMillis(500)),
+                Instant.ofEpochSecond(offset).plus(ONE_DAY),
             )
-            val currentNextRequestTime = userNextRequest[request.user.versionedId]
             val nextRequestTime = Instant.now().plus(SUCCESS_BACK_OFF_TIME)
-            userNextRequest[request.user.versionedId] =
-                currentNextRequestTime?.let {
-                    if (currentNextRequestTime > nextRequestTime) {
-                        currentNextRequestTime
-                    } else {
-                        nextRequestTime
-                    }
-                }
-                    ?: nextRequestTime
+            userNextRequest[request.user.versionedId] = userNextRequest[request.user.versionedId]?.let {
+                if (it > nextRequestTime) it else nextRequestTime
+            } ?: nextRequestTime
         } else {
             if (request.startDate.plus(TIME_AFTER_REQUEST).isBefore(Instant.now())) {
                 logger.info("No records found, updating offsets to end date..")
@@ -152,6 +144,8 @@ constructor(
                     request.endDate,
                 )
                 userNextRequest[request.user.versionedId] = Instant.now().plus(BACK_OFF_TIME)
+            } else {
+                userNextRequest[request.user.versionedId] = Instant.now().plus(BACK_OFF_TIME)
             }
         }
         return records
diff --git a/oura-library/src/main/kotlin/org/radarbase/oura/user/OuraUser.kt b/oura-library/src/main/kotlin/org/radarbase/oura/user/OuraUser.kt
index 2b33c3d8..57905f8e 100644
--- a/oura-library/src/main/kotlin/org/radarbase/oura/user/OuraUser.kt
+++ b/oura-library/src/main/kotlin/org/radarbase/oura/user/OuraUser.kt
@@ -16,12 +16,13 @@ data class OuraUser(
     @JsonProperty("externalId") override val externalId: String?,
     @JsonProperty("isAuthorized") override val isAuthorized: Boolean,
     @JsonProperty("startDate") override val startDate: Instant,
-    @JsonProperty("endDate") override val endDate: Instant,
+    @JsonProperty("endDate") override val endDate: Instant? = null,
     @JsonProperty("version") override val version: String? = null,
     @JsonProperty("serviceUserId") override val serviceUserId: String? = null,
 ) : User {
     override val observationKey: ObservationKey = ObservationKey(projectId, userId, sourceId)
     override val versionedId: String = "$id${version?.let { "#$it" } ?: ""}"
 
-    fun isComplete() = isAuthorized && startDate.isBefore(endDate) && serviceUserId != null
+    fun isComplete() =
+        isAuthorized && (endDate == null || startDate.isBefore(endDate)) && serviceUserId != null
 }
diff --git a/oura-library/src/main/kotlin/org/radarbase/oura/user/User.kt b/oura-library/src/main/kotlin/org/radarbase/oura/user/User.kt
index ee6fd496..b2247354 100644
--- a/oura-library/src/main/kotlin/org/radarbase/oura/user/User.kt
+++ b/oura-library/src/main/kotlin/org/radarbase/oura/user/User.kt
@@ -10,7 +10,7 @@ interface User {
     val sourceId: String
     val externalId: String?
     val startDate: Instant
-    val endDate: Instant
+    val endDate: Instant?
     val createdAt: Instant
     val humanReadableUserId: String?
     val serviceUserId: String?