> For instance, sending someone a text and saying "don't worry about this until you're back from your break" will yield little to no effect, as they value being completely disconnected from work during any hours they're not being paid for.
That's interesting. As someone who works from Poland with US companies, this is opposite of what I do. There is little common time despite me being very much not a morning person, so I think giving ~20 minutes of my evening by responding to people in US is very reasonable.