Commute ~ 4 times/wk, 11-14 mi round trip
One day a wk I go for 10-15 mi after work to explore the area near work
On one of my days off I will ride 25-60 mi.
One day off the bike
This time of year my weekend rides are averaging 30ish. My favorite plans are loops with a little exploration thrown in. Saturday I had a loop that google maps said was 35 mi. When I finished the computer said it was 43. Obviously I don't follow the plan to the letter.. Think of the plan as a suggestion.
On doing small loops repeatedly.. They bore me after a while. There have been loops of 1-3 mi where my average speed could be raised significantly. The same would be true of climbing in a parking garage for me.
On speed. My bike computer gives me about 12 mph average. Sometimes less. But door to door 10 mph is more accurate. There are bike trails and MUPs where higher speeds are sustainable. But I can't get there, wherever my there is, solely on the trail system.