Unfortunately you have to have your entire run on record or else we cant say how much time has passed from the point of the stoppage until the end of the run. Its just not fair to assume some kind of time and impossible to figure out mathematically

Always turn off the setting "Water Shader" in the advanced settings option. Its the most probable problem for game crashing and graphics bugging in the entire game after speedrunning a while or generally playing the game for a extended amount of time

^^^^^This. It just works for me when I open Livesplit as a Administrator aswell

I went on to try and find out myself but I think you can't do that. Livesplit would show in OBS but you can't see it while you're playing yourself. You would have to disable fullscreen and lower the resolution a bit and then It should work. In OBS you can still configure it, so it looks like its all on fullscreen in the recording.. thats how I done it atleast. Maybe someone else knows how but that was my way.