The longest I've only ever gone is 8.5 minutes. I've been working out really hard to get my leg strength up.
I went to the gym this morning at 0530 before anyone else was there and decided to see what I could do.... 21 minutes!
It AMAZES me to see how stamina and abilities change.... something that 3 weeks ago would have NEVER happened, I did today - and it wasn't unbearably hard!!



21 mins is AWESOME!!! Yay! 
). It's amazing how we really can change our bodies, our habits, our outlook, anything through a little work and determination!