This is somewhat an impossible question to answer. How long is a piece of string?
It really depends on how dedicated you are to improving your golf game. If you are a once a month at best golfer that enjoys the hack around and skin fall of beers afterwards in the clubhouse bar, then paying out on average £50 per hour for a lesson is really not going to make a huge amount of difference. However, if you are an aspiring low handicap golfer, constantly looking to improve and gain that competitive or a regular Saturday club competition or social golfer then lessons are a necessity.
You can buy all the latest golf equipment that leads into the hundreds of pounds but unless you have the correct technique and basic knowledge acquired through hours of lessons it will not make the slightest bit of difference. It is amazing the amount of money spent on the latest golf equipment from the average regular golfer. That same golfer could probably count on one hand the number of lessons that he/she has had. Even then they were probably a gift from a friend or relative.
Golf is a game that you can continually improve upon. Golfers are always trying something new they have picked up, whether that be from watching the live golf on sky, reading it in golf monthly or what a fellow golfer has shown them on the driving range.
If you watch or read about the playing professionals they have a retained coach who is giving them lessons on a weekly basis. The point is, if a playing professional on the European Tour or similar has a lesson or more a week when he/she earns millions a year in prize money from our beautiful game, you as an amateur should be having one a day to get better. As we all know that is unrealistic so the answer to how many lessons should you have is……. As many as you can, one can afford and two dedicate the time to. Only then will you improve as a golfer at any level.