Your rabbit should ideally have the same amount of exercise as a wild rabbit or at least three hours of free-range time each day – this lets them have a chance to run about, mix with their buddies and generally hang out! It is important that rabbits living in hutches have long runs so they have the opportunity to exercise lots. The RSPCA suggests that for one or two compatible rabbits (2 kg in weight) should have accommodation that is at least 3m x1m x1m – this includes an exercise and a sleeping area. Your rabbits should have access to both the sleeping area and their run 24/7.
Of course, house rabbits have the advantage of been able to run around the house during the day which gives them as much exercise as they need!