Questions about Anterior Pelvic Tilt

Its come to my attention that I have Anterior Pelvic Tilt (APT). I read this write up on Correcting APT but still have a couple questions that aren't clearly addressed in there.

1. How many of these exercises per set and how many times a week should the be performed?

2. What is the timeline it would take to start to see an improvement? And is this something that can come back in the future after corrected?