Hi there, I cant seem to get this working on 7D2D, the play time does not increase. I also see errors in the logs like this...

Failed to call hook 'OnUserDisconnected' on plugin 'PlaytimeTracker v0.2.2' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.PlaytimeTracker+StoredData+UserData.OnUserDisconnected () [0x00000] in <80d8185051f94e16a35d6305e80bf03e>:0

  at Oxide.Plugins.PlaytimeTracker+StoredData.OnUserDisconnected (Oxide.Core.Libraries.Covalence.IPlayer user) [0x00015] in <80d8185051f94e16a35d6305e80bf03e>:0

  at Oxide.Plugins.PlaytimeTracker.OnUserDisconnected (Oxide.Core.Libraries.Covalence.IPlayer user) [0x00000] in <80d8185051f94e16a35d6305e80bf03e>:0

  at Oxide.Plugins.PlaytimeTracker.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00142] in <80d8185051f94e16a35d6305e80bf03e>:0

  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <42f9bedc659b4f4786eb778d3cd58968>:0

  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <8cb2d664f1574f2b96d53f1c1869d96a>:0

  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <8cb2d664f1574f2b96d53f1c1869d96a>:0

Just tested it (using it with player rankings) and it progressed from 11976.77 to 11977.22 with no problems.

likely a corrupted datafile. check /oxide/data/PlaytimeTracker/user_data.json, if it contains the word null unload the plugin and delete it

This is a fresh install on a 7 Days to Die server. Ill try fix it but I keep getting this

Timed out waiting for plugin to be compiled: PlaytimeTracker
Unable to load PlaytimeTracker. Timed out waiting for compilation
Previous version of plugin failed to load: PlaytimeTracker

pookins

Just tested it (using it with player rankings) and it progressed from 11976.77 to 11977.22 with no problems.

Did you test this on a 7 days to Die server? It works perfectly fine on my Rust server.