diff --git a/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/checks/fight/FightData.java b/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/checks/fight/FightData.java
index bb512eba..dcdb1a96 100644
--- a/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/checks/fight/FightData.java
+++ b/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/checks/fight/FightData.java
@@ -85,6 +85,7 @@ public class FightData extends ACheckData {
     public double lastAttackedX		= Integer.MAX_VALUE;
     public double lastAttackedY;
     public double lastAttackedZ;
+	public long regainHealthTime    = 0;
 //    public double lastAttackedDist = 0.0;
     public long damageTakenByEntityTick;
 
diff --git a/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/checks/fight/FightListener.java b/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/checks/fight/FightListener.java
index e1f8403a..3e6d7ccf 100644
--- a/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/checks/fight/FightListener.java
+++ b/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/checks/fight/FightListener.java
@@ -318,13 +318,16 @@ public class FightListener extends CheckListener {
         if (event.isSprinting()) FightData.getData(event.getPlayer()).knockbackSprintTime = System.currentTimeMillis();
     }
     
-    @EventHandler(ignoreCancelled = true, priority = EventPriority.MONITOR)
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
     public void onEntityRegainHealth(final EntityRegainHealthEvent event){
     	final Entity entity = event.getEntity();
     	if (!(entity instanceof Player)) return;
     	final Player player = (Player) entity;
     	final FightData data = FightData.getData(player);
-    	// Set health to maximum.
+    	// Remember the time.
+    	data.regainHealthTime = System.currentTimeMillis();
+    	// Set god-mode health to maximum.
     	data.godModeHealth = Math.max(data.godModeHealth, player.getHealth() + event.getAmount());
+
     }
 }
diff --git a/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/utilities/CheckUtils.java b/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/utilities/CheckUtils.java
index df5534af..3bb8b3d4 100644
--- a/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/utilities/CheckUtils.java
+++ b/NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/utilities/CheckUtils.java
@@ -7,6 +7,10 @@ import org.bukkit.entity.Vehicle;
 import org.bukkit.event.player.PlayerTeleportEvent.TeleportCause;
 import org.bukkit.util.Vector;
 
+import fr.neatmonster.nocheatplus.checks.blockbreak.BlockBreakData;
+import fr.neatmonster.nocheatplus.checks.combined.CombinedData;
+import fr.neatmonster.nocheatplus.checks.fight.FightData;
+import fr.neatmonster.nocheatplus.checks.inventory.InventoryData;
 import fr.neatmonster.nocheatplus.checks.moving.MovingConfig;
 import fr.neatmonster.nocheatplus.checks.moving.MovingData;
 import fr.neatmonster.nocheatplus.logging.LogUtil;
@@ -284,4 +288,37 @@ public class CheckUtils {
 			System.out.println(player.getName() + " vehicle set back: " + location);
 		}
 	}
+	
+	/**
+	 * Guess some last-action time, likely to be replaced with centralized PlayerData use.
+	 * @param player
+	 * @param Timestamp of the moment of calling this.
+	 * @param maxAge Maximum age in milliseconds.
+	 * @return Return timestamp or Long.MIN_VALUE if not possible or beyond maxAge.
+	 */
+	public static final long guessKeepAliveTime(final Player player, final long now, final long maxAge){
+		final int tick = TickTask.getTick();
+		long ref = Long.MIN_VALUE;
+		// Estimate last fight action time (important for gode modes).
+		final FightData fData = FightData.getData(player); 
+		ref = Math.max(ref, fData.speedBuckets.lastAccess());
+		ref = Math.max(ref, now - 50L * (tick - fData.lastAttackTick)); // Ignore lag.
+		// Health regain (not unimportant).
+		ref = Math.max(ref, fData.regainHealthTime);
+		// Move time.
+		ref = Math.max(ref, CombinedData.getData(player).lastMoveTime);
+		// Inventory.
+		final InventoryData iData = InventoryData.getData(player);
+		ref = Math.max(ref, iData.fastClickLastTime);
+		ref = Math.max(ref, iData.instantEatInteract);
+		// BlcokBreak/interact.
+		final BlockBreakData bbData = BlockBreakData.getData(player);
+		ref = Math.max(ref, bbData.frequencyBuckets.lastAccess());
+		ref = Math.max(ref, bbData.fastBreakfirstDamage);
+		// TODO: More, less ...
+		if (ref > now || ref < now - maxAge){
+			return Long.MIN_VALUE;
+		}
+		return ref;
+	}
 }