Is time or range more important with gluteus medius activation exercise?

I was just on a follow-up call with a trail runner who has chronic ankle instability. She had some follow-up questions about some of the exercises I gave her to do.

Gluteus medius weakness is known to contribute to ankle instability. 

One of the exercises I gave her will strengthen the gluteus medius muscle.

She asked a very specific question about fixing injury when you have identified a weakness, and you are trying to get back to running. 

Which is more important, time or range of movement when you are doing the gluteus medius activation exercises and you have ankle instability? 

Well, that is what we're talking about today on the Doc On The Run Podcast.