I thought it was a good question.
Many of the posts I read, the vibe feels like suggestions of much more than 4 hours of lessons a year.
I think it really depends on the player... Some players may take 4 hours work diligently for several month assimilate the info and be ready for another shot in the arm.....
Other players will take the 4 hours and rest on their morals and not put in the time or abandon the teachings and need the same 4 hours 2 years later....
Today your biggest friend is the video camera... You can submit a video here and get a priority list for the fundamental stuff... Work on it and then when you pay for your lesson it will be more meat and less potatoes...
I can video tape myself and I am sure everyone can spot what they think I need to fix...
I raise up on shots that I am taking speed off of.. Is it a bad habit if it is something I do purposely knowing that as long as I raise up online it shouldn't effect my shot?? I don't think so but I have had several instructors say it is.. I didn't solicit the advice btw...
I am sure others would note that I am inconsistent with my bridge length.
That I don't drop down on the shot line but end up moving into it from either the left or the right...
I would bet my eye patterns are not at all what they should be....
I drop my elbow to get thru the ball NOT after contact.....
My head position varies in height....
I don't use the bridge when I should or EVER.......
My PSR reveals that I have ADHD... This is blatantly obvious in that if I remember to chalk it is always after I have walked to the other side of the table and will have to walk all the way back around...
The only time I walk around and survey the table is when I remember to chalk.... See Above.....
AT this point these are all things that I know a video would reveal... Now the tough part is do I try and practice to correct them or do I take a lesson and get a game plan together for getting it done???
Well here is where the rubber hits the road... I have known all of these things for years... I have fixed none of them... IF I go practice I get to the point that none of the issues really bother me... As long as I am hitting balls every day I can play shortstop speed... If I am not hitting balls every day and only playing rarely then I think that every problem I mentioned becomes an issue to consistent play....
AT this point I likely will be looking for lessons when I get time to spend on the table again and I will not use my normal DIY approach...
After the lesson maybe the practice will get me thru to the next level for good... Lord knows I've visited it enough... Would be nice to live there.....
Chris