Time or mileage?

[ny biker]

and I am having a blast!

Well that's the most important thing!

I don't know if there's a right or wrong answer. When I first started riding I would base rides mostly on time, mostly just going out for an hour or so. After a couple of years someone asked me to do a 65 mile ride with him, and that's when I started using miles for a goal.

For weekend rides (or any day when I have flexibility on how much time I can spend on a ride) I will choose a ride based on how many miles it is and how that fits with whatever I'm training for and where I am in my training. On weekdays when I ride after work I focus more on a time limit, which is based on how long before it gets dark.