I used to commute about 12-15 miles each way on a daily bases for a copula years. My biggest problem was not the time or distance. It was having a back up in case of inclement weather or mechanical failure.
One time popped a tire and ended up bending my wheel tipping over to the side of the road. A passer by, who had seen me riding regularly on the road, threw me and my bike into the back of his truck and drove us on to work. I still appreciate that ride for sure...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)