igt doesnt include pauses and loads while rta is all the time from the start to the end

RTA includes all the time from when you spawn in a new world to getting to the credits. IGT doesn't include loads and pauses. So you could technically speaking pause your game during a run and take a nap for 10 hours and come back and finish it. (though I highly doubt that the run gets verified).

@IEatPigeons Do you know how to set it up with LiveSplit or other timers, or were you just asking?