I don't do much climbing, there's a 130ft hill that I can climb up for practice that's less than a mile away, the biggest I've climbed up is ~800ft, last weekend I climbed 650ft, the last serious hill before that was 275ft and I was sick at the top but plenty of time on the trainer over the winter has improved that, I still prefer to avoid hills.
Edited to include distances:
800ft - 3 miles
650ft - 1.5miles
275ft - 1 mile
130ft - 0.62 miles
This is what you get when you live near the Cotswold ridge!