diff --git a/app/src/main/java/net/pokeranalytics/android/PokerAnalyticsApplication.kt b/app/src/main/java/net/pokeranalytics/android/PokerAnalyticsApplication.kt
index ce9399f0..4032bd0c 100644
--- a/app/src/main/java/net/pokeranalytics/android/PokerAnalyticsApplication.kt
+++ b/app/src/main/java/net/pokeranalytics/android/PokerAnalyticsApplication.kt
@@ -76,7 +76,7 @@ class PokerAnalyticsApplication : Application() {
 
 		if (BuildConfig.DEBUG) {
 			Timber.d("UserPreferences.defaultCurrency: ${UserDefaults.currency.symbol}")
-			this.createFakeSessions()
+//			this.createFakeSessions()
 		}
 
 		Patcher.patchAll(this.applicationContext)
diff --git a/app/src/main/java/net/pokeranalytics/android/calculus/optimalduration/CashGameOptimalDurationCalculator.kt b/app/src/main/java/net/pokeranalytics/android/calculus/optimalduration/CashGameOptimalDurationCalculator.kt
index 25583d84..935e273f 100644
--- a/app/src/main/java/net/pokeranalytics/android/calculus/optimalduration/CashGameOptimalDurationCalculator.kt
+++ b/app/src/main/java/net/pokeranalytics/android/calculus/optimalduration/CashGameOptimalDurationCalculator.kt
@@ -8,6 +8,7 @@ import net.pokeranalytics.android.model.filter.QueryCondition
 import net.pokeranalytics.android.model.realm.Session
 import org.apache.commons.math3.fitting.PolynomialCurveFitter
 import org.apache.commons.math3.fitting.WeightedObservedPoints
+import timber.log.Timber
 import java.util.*
 import kotlin.math.pow
 import kotlin.math.round
@@ -44,13 +45,18 @@ class CashGameOptimalDurationCalculator {
 
 			val sessions = query.queryWith(realm.where(Session::class.java)).findAll()
 			val sessionsByDuration = sessions.groupBy {
-				round((it.netDuration / bucket).toDouble()) * bucket
+				val dur = round((it.netDuration / bucket).toDouble()) * bucket
+				Timber.d("Stop notif > key: $dur")
+				dur
 			}
 
 			// define validity interval
 			var start: Double? = null
 			var end: Double? = null
 			var validBuckets = 0
+
+			val hkeys = sessionsByDuration.keys.map { it / 3600 / 1000.0 }.sorted()
+			Timber.d("Stop notif > keys: $hkeys ")
 			for (key in sessionsByDuration.keys.sorted()) {
 				val sessionCount = sessionsByDuration[key]?.size ?: 0
 				if (start == null && sessionCount >= minimumValidityCount) {
@@ -61,12 +67,15 @@ class CashGameOptimalDurationCalculator {
 					validBuckets++
 				}
 			}
+			Timber.d("Stop notif > validBuckets: $validBuckets ")
 			if (!(start != null && end != null && (end - start) >= intervalValidity)) {
+				Timber.d("Stop notif > invalid setup: $start / $end ")
 				return null
 			}
 
 			// define if we have enough sessions
 			if (sessions.size < 50) {
+				Timber.d("Stop notif > not enough sessions: ${sessions.size} ")
 				return null
 			}
 
@@ -115,6 +124,7 @@ class CashGameOptimalDurationCalculator {
 				return bestDuration
 			}
 
+			Timber.d("Stop notif > not found, best duration: $bestDuration")
 			realm.close()
 			return null
 		}
diff --git a/app/src/main/java/net/pokeranalytics/android/ui/modules/session/SessionFragment.kt b/app/src/main/java/net/pokeranalytics/android/ui/modules/session/SessionFragment.kt
index 32bc7f62..c9ccbcc4 100644
--- a/app/src/main/java/net/pokeranalytics/android/ui/modules/session/SessionFragment.kt
+++ b/app/src/main/java/net/pokeranalytics/android/ui/modules/session/SessionFragment.kt
@@ -401,7 +401,7 @@ class SessionFragment : RealmFragment(), RowRepresentableDelegate {
 			if (!isDetached) {
 				optimalDuration?.let {
 
-					val delay = 1000L // it.toLong()
+					val delay = it.toLong()
 					scheduleNotification(delay, "stop notif tag")
 
 					val formattedDuration = (it / 3600 / 1000).formattedHourlyDuration()
@@ -429,7 +429,7 @@ class SessionFragment : RealmFragment(), RowRepresentableDelegate {
 			.addTag(tag)
 			.build()
 
-		WorkManager.getInstance().enqueue(work)
+		WorkManager.getInstance(requireContext()).enqueue(work)
 	}
 
 	/**