What is the benefit of an all-day rate?
Most places will get you out for 36 holes, should you set up a pair of times. If they won't, they're not worth your effort.
If I want to play a golf course more than twice in a day, I'm probably looking to play a 100-Hole charity event.
If you really want to study a course, should you be playing golf at the same time?
If you really want to photograph a course, see above.
I think that great golf courses and more than 45 holes in a day are mutually exclusive, unless it is shoulder season, and then the lack of daylight precludes your succeeding.
Away with your thoughts, lubbards!