I don't think it's so much about the time-frame, as it is about the changes you make in your life during that time.
I had to make changes about who was in my life and what I did.
I got back to walking/hiking and found so much enjoyment there. It became part of my daily routine. I removed a couple of toxic people from my life and 'out of nowhere' two incredible women appeared in my life.
I think it's about the changes that come from within more than the amount of time.