The time response is the correct answer for all riding.
I spend a lot of time on the trainer in the fall and winter - sometimes as much as 20 hours a week depending on the weather and my needs. How far I go is really irrelevant compared to how much time I spend pedaling and whether I am getting the proper workout in during that time. The same goes for my summer, outdoor riding.
That said, I do have a Garmin, and I always get a kick out of the map from my trainer rid; it looks like I have been zigzagging all over my house.