How long should I use crutches?

Today's episode comes from a question posted as a YouTube video comment. 

That video was explaining how using crutches for a short period of time can help injured runners. 

I wasn't talking about months of crutches, not many weeks, but a short period of time to try to accelerate the process of healing over-training injuries.

In the comments someone posted and said, "How long would you use crutches for this...?" 

How long should I use crutches? 

Well, that's a million-dollar question!  And that's what we're talking about today on the Doc On The Run Podcast.