ive had mine going for at least 12 hours now is there a point when i shoud cancel it and restart it seems like its moving just wondering how long is to long

~6-8 hours seems to be average. 12 is not completely unheard of but is outside norms. Personally, I'd just leave it anyway as long as it's still doing work. If it's hung on one file then I'd think about restarting it.