I felt a stretch in the inner side of my knee a couple hours ago and felt sharp pain and a pop. it hurt slightly after but kept getting better over time. it it happend a couple of times while i was running but it's mostly ok.will it take long to heal?

It could be a muscle sprain or a strained ligament. I doubt any internal knee derangement if there's no swelling. Refraining from further stress on the knee for a week or so should result in resolution of your symptoms.

If it is already feeling better, that is a good sign. Give it rest, and time to heal, and expect resolution in 2-3 weeks. If persists, or worsens, then consider evaluation.