How long would 12 mile bike ride riding comfortably on a mountain bike on the rode take?

it obviously depends how fast you can ride a bike and how long you can go without stopping

Depends on a lot of things. A fit rider can do 20 MPH for several hours under reasonably easy riding conditions, so with a few pit stops you'd might be able to pull it off in 18-20 hours continuous...

Depends on a lot of things. A fit rider can do 20 MPH for several hours under reasonably easy riding conditions, so with a few pit stops you'd might be able to pull it off in 5-6 hours.

Depends on which speed you're able to keep. A fit rider on good, flattish roads could make it in 90 minutes. An average rider on decent roads could do it in one three hours. Poor rider, poor...

Depends on which speed you're able to keep. A fit rider on good, flattish roads could make it in 30 minutes. An average rider on decent roads tould do it in one hour. Poor rider, poor conditions, it...