SMO, you must not have had a microfracture if immediate weight bearing. You likely had just a partial meniscectomy.
Standard post-op protocol for microfracture is 6-8 weeks on crutches but immediate motion in either a stationary bike/trainer (lowest resistance) or CPM (continuous passive motion machine) or both as much as possible in the early recovery phase. Recovery to running takes 9-12 months. If you run earlier, you can disrupt the healing of the microfracture. Many athletes have returned too early after a microfracture and fail as a result of that. Unfortunately, it really is a long healing process. Returning to running really depends on a multitude of factors and most importantly the overall health of the remaining cartilage of your knee. That is something you really have to discuss with your doctor and there are different severity of damage that could require a microfracture. One persons microfracture could be very small with pristine surrounding cartilage and would expect full recovery. Another could be a very large lesion with some cartilage wear in other parts of knee (in which case a microfracture probably shouldn’t be performed in the first place) and would not expect to get this person back to much running.
Microfracture also is best in young (i.e. <35 years old). In older people, the cartilage wear is generally more diffuse and not a great candidate of microfracture (exceptions exist of course). I trained under the doctor who invented the procedure (Dr Richard Steadman) so know it extremely well.
Good luck