Leg hair grows back more slowly, on average, than other types of body hair. Some people will only be able to maintain smoothness for the day of the shave, whereas others might be smooth for longer.
I don't know if hormones made much of a difference for me in this regard. It might grow back more slowly - I'm not sure. I didn't shave my legs as a guy.
It's almost definitely not the hormones in you - it's just how you are. You may have low testosterone, or good genes.