When do you do your leg day?

So I was previously biking to work 5 times a week, a round trip was about 21 km (which is short for me but the difficult parts were the climbs). I would work out on Monday, Wednesday and Friday but had a difficult time slotting in a proper and consistent leg day.

I couldn’t do it on the weekdays because I might get fucked on climbs during cycling to work and I didn’t want to do it in the weekend cause I wanted to bike for leisure.

When do you do your leg day?