Hi guys,   I've been playing for about 2.5 months and got so addicted to golf, that taking a day off is next to impossible and I end up in a golf club anyway for a sandwich and a cup of tea while watching people finishing the 18th hole :)   My question is - when you are out on a driving range, how many balls do you use on an average session? I am feeling quite exhausted after 150-180, but I notice people practicing there with at least 250+ ? Is it a matter of training?...