Lots of details missing that would clarify this. We live in so Cal - that day was a beast. Like an oven outside. So, go inside and deliver the mail tomorrow??
I’m surprised they don’t start their route at 4 am and finish at 11 am. My kid brother was on a construction gang in Las Vegas which did that during the summer. The pay was great, but he ended up taking a pay cut to work as a line cook in a casino. It took him a 10 hour day to earn what he did in con struction in 8 hours, but he had energy to do something when the work day was done.