It depends on the injury. A simple strain or sprain may take 6-12 weeks whereas a broken bone or surgery may be 6-12 months. Individualized factors play a big part in this including the tissue that has been damaged, what sport you are returning to, and how long it takes to reach specific performance marker milestones. Your sport physiotherapist will keep you motivated and inspired throughout your rehabilitation so however long it takes the time will fly by.