That's great! When you get better in shape, you'll probably be only 5 minutes slower by bike: the amount of time it takes to walk in from the parking lot if you drive. Then 10 minutes in the bathroom, which, face it, you'll take anyway, driving or not.
Keep it up!
__________________
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --
the tiniest sprinter