It depends on the person and their ability. Maybe an hour's worth, like Michael "Charlie" Gove suggested was reasonable a few years ago?
If we really want to hurt Putin, maybe we should ban all private car journeys of 5-miles or less as a wartime measure? That would roughly halve the number of trips being made.
That depends on the work, but I wasn't addressing driving for work purposes, not least because presumably work pays for them, so it shouldn't cause a choice between feeding children and feeding the car.
Does working two jobs make you more likely to drive? Why?
Probably a bit of both, plus as I wrote on the mothership, if you're like most motorists, you probably aren't accounting for the marginal costs of things like servicing and insurance, or your time effectively working at driving yourself when you could be reading a book or posting shoot on forums or whatever you do for fun.