Being able to tell a client when you can get back to them will go a very long way towards mitigating their needs. For them it may be urgent, but knowing when it will get someone’s full attention, I’ve found is often enough. It’s basically saying someone is on this, and it’s in their priority list. It feels almost magical every time I’ve done it. The trick is having someone who can triage at odd hours in a way that doesn’t purpetuate the problem of having people be on when they shouldn’t.