In my experience, in IT not software dev, you need mgmt to buy in that those hours are worth it and that they need to build those hours into everyday.

Can be sold as an on-boarding tool if you are in a large team some moderate turn over. Or as an insurance policy if you have a very small team with a few key team members, if we lost them for any reason would be a substantial setback to productivity.

In general I think people like good docs but fail to think about how to get there. Time must be spent.