As mentioned above, it may be overload. Maybe you don't run much at ordinary times, but since you can run for an hour, you should run a lot at ordinary times, so it is more likely to be the following problem.

In addition, there may be running posture problems. If you are used to running with your legs completely straight or even folded back, it may cause great pressure on the meniscus and cause knee pain (because of playing basketball, there was a problem with running posture for a while, and your knee hurt, but you will be fine after correction).