Frequency of strength / core training

I am wondering about the ideal frequency of strength and core training exercise.

I mainly want to focus on quadriceps / knees / hips.

As I am time crunched, is it ideal to do strength training 6 times a week for only 15 minutes each time, or is it better to train 3 times a week for a 30 minute period ?

Or should I train at least 1 hour per workout in order to benefit from strength training ?

Have you checked out any of the existing topics that dive into this with info shared by lots of our athletes?

And here are some worthwhile blog posts to check out:

Quads and hips 2 or 3 times a week, assuming you’re doing weighted exercises.

Core/mobility as often as you want.