I have a group play with on Saturdays and they never mark their balls unless they are in or near someones line... or they will mark to pick up and re-align... and typically they will go ahead and finish up if they are within a foot or so after 1st putt... All in all, the time spent on the green is a lot less. My Sunday group ALWAYS marks their balls regardless of location on the green and will on finish up if its a couple of inches... All in all, they spend ALOT of time on the green... Do you guys/girls have a problem with not marking if its not in the way or immediate line of sight? it doesn't matter to me either way but I was just curious what kind of "rules" you all play by.