Injured during marathon training

Im currently dealing with knee pain, and my physical therapist has recommended avoiding running for the next week to a week and a half. How should I approach cross-training during this period? For example, if I'm substituting biking or swimming for running, how should the time or intensity compare? If I'm supposed to run 10 miles, should I spend the same amount of time swimming or biking as I would running that distance? Additionally, on days when I incorporate interval training, how can I adapt that for