diff --git a/Plan/api/build.gradle b/Plan/api/build.gradle
index cd70e6ed6..0dad51d1a 100644
--- a/Plan/api/build.gradle
+++ b/Plan/api/build.gradle
@@ -7,7 +7,7 @@ dependencies {
     compileOnly "com.google.code.gson:gson:$gsonVersion"
 }
 
-ext.apiVersion = '5.1-R0.2'
+ext.apiVersion = '5.1-R0.3'
 
 bintray {
     user = System.getenv('BINTRAY_USER')
diff --git a/Plan/api/src/main/java/com/djrapitops/plan/capability/Capability.java b/Plan/api/src/main/java/com/djrapitops/plan/capability/Capability.java
index b1ac9bf8c..b3e4ede2e 100644
--- a/Plan/api/src/main/java/com/djrapitops/plan/capability/Capability.java
+++ b/Plan/api/src/main/java/com/djrapitops/plan/capability/Capability.java
@@ -17,6 +17,7 @@
 package com.djrapitops.plan.capability;
 
 import java.util.Optional;
+import java.util.UUID;
 
 /**
  * List of different capabilities current version provides.
@@ -59,6 +60,10 @@ enum Capability {
      * {@link com.djrapitops.plan.query.QueryService} and {@link com.djrapitops.plan.query.CommonQueries}
      */
     QUERY_API,
+    /**
+     * {@link com.djrapitops.plan.query.CommonQueries#fetchCurrentSessionPlaytime(UUID)}
+     */
+    QUERY_API_ACTIVE_SESSION_PLAYTIME,
     /**
      * {@link com.djrapitops.plan.settings.SettingsService}
      */
diff --git a/Plan/api/src/main/java/com/djrapitops/plan/query/CommonQueries.java b/Plan/api/src/main/java/com/djrapitops/plan/query/CommonQueries.java
index ceb2740b4..1d617384e 100644
--- a/Plan/api/src/main/java/com/djrapitops/plan/query/CommonQueries.java
+++ b/Plan/api/src/main/java/com/djrapitops/plan/query/CommonQueries.java
@@ -43,6 +43,16 @@ public interface CommonQueries {
      */
     long fetchPlaytime(UUID playerUUID, UUID serverUUID, long after, long before);
 
+    /**
+     * Get playtime of current online session.
+     * <p>
+     * Requires Capability QUERY_API_ACTIVE_SESSION_PLAYTIME
+     *
+     * @param playerUUID UUID of the player.
+     * @return Milliseconds the player has played during current online session. 0 if player is offline.
+     */
+    long fetchCurrentSessionPlaytime(UUID playerUUID);
+
     /**
      * Fetch last seen Epoch ms for a player on a server.
      *
diff --git a/Plan/common/src/main/java/com/djrapitops/plan/query/CommonQueriesImplementation.java b/Plan/common/src/main/java/com/djrapitops/plan/query/CommonQueriesImplementation.java
index bba7113ce..a45f71ed0 100644
--- a/Plan/common/src/main/java/com/djrapitops/plan/query/CommonQueriesImplementation.java
+++ b/Plan/common/src/main/java/com/djrapitops/plan/query/CommonQueriesImplementation.java
@@ -16,6 +16,8 @@
  */
 package com.djrapitops.plan.query;
 
+import com.djrapitops.plan.gathering.cache.SessionCache;
+import com.djrapitops.plan.gathering.domain.Session;
 import com.djrapitops.plan.storage.database.DBType;
 import com.djrapitops.plan.storage.database.Database;
 import com.djrapitops.plan.storage.database.queries.objects.ServerQueries;
@@ -42,6 +44,11 @@ public class CommonQueriesImplementation implements CommonQueries {
         return db.query(SessionQueries.playtimeOfPlayer(after, before, playerUUID)).getOrDefault(serverUUID, 0L);
     }
 
+    @Override
+    public long fetchCurrentSessionPlaytime(UUID playerUUID) {
+        return SessionCache.getCachedSession(playerUUID).map(Session::getLength).orElse(0L);
+    }
+
     @Override
     public long fetchLastSeen(UUID playerUUID, UUID serverUUID) {
         return db.query(SessionQueries.lastSeen(playerUUID, serverUUID));