Let's see... I've been riding a couple years now. The vast majority of my rides are commutes: 13.5 to 15 miles, trending uphill on the way out takes me 52 to 55 minutes. Trending downhill on the way back takes me right around 50 minutes (those are summer speeds; in the winter it's a whole different ball game!). Generally I measure my elevation gain in hundreds, rather than thousands, of feet. A hilly ride might include 1,000 feet of elevation gain.
I did my 3 centuries at a 16-mph pace; alone I ride 14.5 or 15 mph. Not exactly a speed demon here. I'd like to get a little faster, but I never push myself commuting because I know I have to do this ride 10 times in a week. Pushing myself one day means the remaining rides will feel endless.
ETA: The hilliest ride I've done so far, the King's Tour of the Quabbin, was a century that involved 7,000 feet of elevation gain. It took me forever and my legs wanted to fall off at the end.
ETA 2: This thread got me thinking (a dangerous pastime, I know). I should just start measuring all my riding metrics in metric units. I could ride 21.7 km at a 25.7 kph pace every day. It's like improving with no work!



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