I have not ridden in years. I remember when I started riding to work in the am and then home for lunch.
I would "easy pedal" six miles into work in the am, wipe off in the men's room (no shower), then power ride home for lunch, take a run, have a shower and drive back to work with a sack lunch to eat at my desk
Those first couple weeks were HARD. But after that it was like anything else - your muscles adapt.
Good for you.