Thanks for all the replies, it helped spell out some things that I didn't fully get.

I assume that doing a 2x20 or a 1 hour wouldn't crossover from running to biking, but would it still work for finding information specifically towards running?

I am not competitive, but I just like the stats and being able to track changes. It is hard for me to get the full number cycling, because there isn't anywhere to ride without stopping at traffic immediately around. Later when I get some time I might go to a park with a 5 mile loop that is a little bit away from me, or maybe try our my city's old velodrome.