How many Pro lessons?
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It depends on your goals and the amount of time you have available for practice. I use Evolvr and I will send in 2 to 4 videos a month. I work on one priority piece at a time. I did not use Evolvr last year due to time commitments. Some of the video uploads are sent to show progress even though I have not fully mastered the key I was working on.
Many forum members use the Member Swings section for the same purpose, and it is free!
When I first decided to get back into the game I took lessons weekly or bi-weekly for several months. Now I take them when I have something specific I want to work on. I try to get in at least five practice sessions largely focused on the topic of the last lesson before considering getting another unless I feel like I just didn't "get it" the first time. Generally my pro will talk me through the "didn't get it" phase without an actual lesson though.
I'm pretty sure there is no right answer to the basic question though. Some people catch on quicker and/or have athletic abilities others don't. Some pros are better teachers/communicators than others too. But I think periodic lessons are going to be a way of life for me so long as I pursue this silly game. Most, if not all, of the tour players pay regular visits to their swing coach...