5.4 road miles in the morning, 6.1 on the way home.
Rides that are for me vary. By time, I usually ride for 2-4 hours, depending on how much time I have available. By distance, hard to say... 5.2 miles with my girlfriend the other day. A bit under 19 last time I did a "real" mountain bike ride and my GPS was working. Just under 20 on a road ride not too long ago, with my all-time records at 100 in a day and 75ish in a ride without stopping for longer than a power bar or bathroom break. 35 off-road on my longest recorded MTB ride, which followed about 6 of messing around on a different trail network with some teammates.
Those aren't averages, I'm afraid. I don't record my mileages.

I can tell you that this year, on average, on days I've ridden, I've ridden for 1.7 hours. That's anywhere from days with half an hour of commuting split into two rides to a day when I rode to meet some teammates, spent a couple hours clinging to a faster one's wheel, and then took the long way home to meet the volume goal I had that day. I'm also about 318 hours of riding in this year.