Op it was on my mind that you might have another child, so really you'd be signing up to do this for the next decade at least, maybe longer if you have a 3rd child
A heck of a lot can change in a decade, you might decide to get a job, DH might change jobs. Illness, injury, car off road for any reason,
I'm in Scotland the legally the max distance primary kids can be asked to walk is 2mile, reality councils provide transport at a mile.
My primary was just under a mile so no transport, it was OK but as kids it took 20-30mins, a smart adult would probably walk it in 15-20. So I'm agreeing your 35min with small kids could be an hour.
If your LO decides for have a poop 💩 that's going to be an uncomfortable baby by the time you get back.
You also need to take into account the nursery run, DC1 to school, then nursery DC2 and the same in reverse.
I wonder how many posters really walk 35-60mins with a small child daily, come on, hurry-up, quickly, keep going, it just sounds tedious.