How long should I bike ride for, daily?

[John S]

I have recently asked here about bike riding, and got great answers, thank you all. But, in order to maintain a healthy life style, how long should I cycle a day? Should I cycle with steadily speed, on a steadily path, or up and down hills? Please note I am trying to have a healthy life style, not trying to lose weight.

 

[Samantha K]

About 1hr, varying speeds, up and down hills is best for working muscles.