Dev hasn't been active for days.
And what's then? I don't think that a dev should be online 24/7. Just stay calm and wait for updates

Not 24/7 that's too much.
A dev must be at least ones a week, leave a messages. This also in order to keep the thread under the attention and so the community is kept informed.
If a dev has nothing news to write, he should write a short summary of the past.
at least this is my opinion