if you’re starting running from scratch:
10mins maximum.
twice a week maximum.
do that for 2 weeks, and see how you feel.
you may be able to ride for hours, but your feet, ankles, knees, hips, back, etc. won’t thank you if you go too far too fast.
You’re only as strong as your weakest joint, and right now you don’t know what that is.
running off road is fun, but technical ground is brilliant at spraining ankles, shoes with thin soles reduce the chance, but these can take some getting used to.
10mins – twice a week, run nicely – not quickly.
run somewhere nice, enjoy it!