A new version of the Auto Splitter is now available in LiveSplit.

You can read more about the update here: https://github.com/Starcrunsher/TitanSoulsAutoSplitter/blob/master/README.md

The Auto Splitter can directly be used via the "Edit Splits" menu of LiveSplit or you can download the script and use it in your LiveSplit layout. The direct link to the autosplitter file is https://raw.githubusercontent.com/Starcrunsher/TitanSoulsAutoSplitter/master/TitanSoulsAutoSplitter.asl

I came up with that idea because I wanted to run a category which contains all levels of the game, but with real times of 6h+ All Teensies and 100% are too long for me at the moment.

To run NG+ All Levels you would start with a 100% save file (like the one linked in the Resources page), and complete all levels in any given order without additional restrictions. So I would suggest the timing starts after the loading screen of the first level you enter, and the timing ends at the end of the last level you will complete (depending on your oder of the level after the last hit on a boss, entering the exit door on a normal level, reaching the end of a invaded level or music level).