A cramp pain typically lasts a matter of minutes. In a few cases that lasts simply seconds, but in some cases it lasts as many as 10 minutes. The severity with the pain ranges. The muscle may remain tender for about 24 hours after a leg cramp. Leg cramping usually occur when you are resting - most frequently at day when in bed. (They are often called night time cramps.) They may wake you. It may be a distressing condition but if the sleep is actually regularly interupted.