Similarly perhaps, I came across a suggestion recently for scheduling email as a matter of course. I tend to respond immediately (if not too intrusive), or make a note to come back to something I mean to respond to, but this idea was that perhaps some time lag as a regular thing makes sense. If I recall correctly, the recipient is not only fine with the delay, but actually considers your response as more worthwhile, because you likely put some time into it. Perception vs reality? If perception is what matters more, that might be a reasonable approach.