The course I grew up on - Effingham GC in Surrey - is pretty good. Just google mapsed it and got a total of 2,405 feet, so 802 yards total, for an average of 47 yards. Shortest one is 9 to 10 - 18 yards.
Walton Heath Old looks like 2,129, for just over 700 total and 42 average. The 5 longest ones are 1,138 of the total, leaving 12 shortest of under 1,000 feet and a 27.5 yard average. 4 on the front nine are less than 20 yards. 2 to 3, 3 to 4, 5 to 6 and 8 to 9. That changes if you play the back tees quite a lot. I think there are 12 holes where you have your back to the green as you walk to the tee.