by "reasonable" and "average" are you looking for what to expect when you're riding at a "reasonable" and "average" pace or are you planning to go all-out for 10 minutes and want to compare the number you get to others?

With Strava Premium there's an analysis feature that will give you estimated power numbers for various timeframes... Maybe take a look at those of other rider with whom you've ridden and/or feel you can keep up with?