My Intel T3100 CPU notebook does about 6 KH/s.
Tried it for 48hs nonstop and nothing wrong happened so far.
It did heat a lot, but we are currently here in the middle of a heatwave with 38C temperatures so it is not strange at all.
Laptop mining is not recommended these days and can never profitable most especially if your mining Bitcoins and other popular altcoins. At 6KH/s it would be too difficult to find a single block and even if you join a pool you might not get any share.