[eropple]

> As a new hire, I would send my mentor a question and it might be ten minutes to fifty minutes before I would get a reply.

This is a weaird problem to me. At my last job, we had the "ask async first" thing--but, yeah, if they're not responding and it's urgent, then of course you go ask them, that's just obvious. But the point is that this behavior should be rare because it's not "momentarily" losing their flow, it's often losing it for ten to fifteen minutes. A two-second IM is less likely to make them lose it than you walking over, so start there.