Depends on the laptop...most are designed to handle 80-90C and will shut down or crash above 90C. Some might be lower and others, best thing you can do is research your laptop model or contact the MFG. Dell is usually pretty good about providing that information and they have pretty good customer service in my experiences.
My Dell is a haswell-based unit and it loads in the upper 70s in games, in some hotter rooms/outside areas...I can reach 80C. I'm not worried about it, haswells are designed to hit up to 100C and throttle. Other components though...ymmv.