1980s USGA Am 36-hole qualifier in the middle of summer at Colonial CC, 100*+, steamy from all the watering to keep the greens alive; no wind, 5+ hour rounds. Caddy "friend" didn't show up until start of 2nd round and had trouble finishing. No lunch break to change shoes, underwear, shirt. Shot 80-88, finishing in the middle of the pack, beat one of the guys in my threesome; the other guy qualified at 3 or 4 over (must have been a really long day for him too). Never tried to qualify for the USGA Am again.