Thank you! That is a really weird bug that's popping up for some players. Could be a memory leak indeed. It's interesting that it's around 15 minutes for everybody who gets this crash (I don't). I will try and get my older laptop running tomorrow just to test it out on a different machine and see if I can get it to crash.
What sort of machine are you running this on? What version of Windows, how much RAM and what graphics card/built-in chip do you have? And is the post-processing effect enabled by any chance? And if you can, please tell me how much memory the game is using according to Task Manager when you play.