A lot of times on the practice green I need to leave one "dead" ball by the hole to let others know this is the hole, and only hole, I am using. Please don't putt to this hole...
Ah, the etiquette of the practice green... should be in the USGA rules. 😁
When I'm on the chipping/putting practice green, I only use two, sometimes three balls.
Never could see the sense in hitting a bag full of balls when other folks were using the same green.
Even my shag stick only holds 14 balls, which I use on the short game course.
I saw "That Guy" the other day, chipping on the practice green. Must of had 30+ balls in play, aim at one target.. There were 4 other folks on the same smallish green. The 30 ball guy was annoyed that the other folks were in his way.
I asked my Granddaughter what was wrong with that picture? She told she was going to practice 50 yard shots, out of everyone else's way.
If you're hitting to the same pin it should be okay. Just don't be the guy who wants to hit the 90 footers to every pin like it was miniature golf or something. Some of us are working on our game with just one pin/hole.