Maybe 6 weeks for putting. I’m 72 in excellent condition. I had a triple bypass on June 9th. Both my cardiologist and the surgeon we definitive that 12 weeks was the minimum for full swing.
I started walking and progressed to very light resistance workouts. At about 6 weeks I was putting. I drove the cart for my wife and placed my ball wherever she wound up on the green. From there it became a putting contest, we’re very competitive.
At 8 weeks I started short swings with my 54 and progressed to 3/4 shots with the same club for the next three weeks. Also at 8 weeks my Dr cleared me for bike riding, swimming and everything but lifting more than 35 Lbs and, of course, the full swing.
I hit my 12 week point last week and played an easy but tentative 9 with my wife on Monday and hit balls the next day with no issues. We’re playing 18 this afternoon.
Good luck, the better shape you’re in going in the better your recovery but expect the first few days to be very hard but do your work and you’ll be back.