Good game

I use SAR_STARTDEMOSFolder to play the world record Demo file learning skills, understand the time difference, every time play to about 30 minutes, my portal2 will crash, After reopening portal2, play Demo can not connect to the previous timing, I can't compare the time difference of the level after 30 minutes, because the timing will start from the beginning. How do I want to watch Demo continuously, in the case of SAR_SR_HUB continuous timing?