Help needed on cooking chili?

I just made a (slow cooker) pot of chili made with TVP (textured vegetable protein) not following a recipe. I'm cooking it on low. Does anyone know how long it should cook and/or can I leave it to cook overnight (it would be cooking for about 12 hours then) or would that be too long? Thanks for your advice.|||low over night|||too long about 3 or 4 hours depends if its spice then about 6