I think this is all dependent on where you live/ride. On MWF I commute, so very little climbing. On T/H I add is some hill repeats or climbing, so 2000 - 3000 in 16-24 miles. On weekends I race, but when I'm not racing, I consider a ride out to the coast and back pretty good. 60-70 miles, 6000-7000 ft of climbing.

As scububa said, riding vs "racing" uphill makes all the difference. Climbing isn't any harder than riding flats - it's just the tendency to want to go faster than 6 mph that makes the difference! That and group rides, of course, where every sustained climb is a race.