Here's what Google says about resting meat after cooking, most here will probably agree with what this says, it's also been my experience.
Carl
If given the time to rest the meat will lose less juice when you cut it and when you eat it the meat will be juicier and tastier. The time taken to rest will depend on its size, a roast is best rested for 10 to 20 minutes before carving. Steaks or chops should stand for 5 minutes (but no less than 3) before serving.