At some point I just decided that, to me, email is an asynchronous medium and I tread it as such. Which means, I will eventually read and answer mail - and by using clever filters staying at zero inbox -, but worst case that's in the morning after coming in (and while checking for failed build reports), or before leaving. Usually I switch tasks once every few hours or a cloud build takes a while, so that's some more opportunity for a quick look.

Similarly, setting my private mobile to DnD for practically the whole day was an enormous boost for my concentration (and sanity). I sometimes check it while skipping a track, but that's enough.

Only drawback as of yet: It often takes me an hour to realize a long running cloud build I queued failed.