I am a teacher in a secondary school.
I started in a new place a few months back. In this place, parents have an app on which they, and students, can message us 24/7 and we are expected to reply as soon as possible, but latest within 24h. The app filters out swearing, but other than that it can be a free-for-all.
I do not have time to respond within a typical school day as I am either teaching, in a meeting or on duty, and with briefings as well, responding to parents either falls within the 15min lunch I get (unpaid) or outside of those hours. Time is fully directed between 8.15 and 4.30 each day and PPA is the absolute minimum school can get away with.
Messages arrive any time between midnight (some students messaging at 1am!) and midnight again, but parents most often message after work (understandably) and will expect us to have responded by mid-day. Some are messages about reasons why homework isn't done, some are asking me about what happened in other subjects, yet others are to challenge detentions given.
Is this level of communication acceptable? It just feels like I'm never off work, because I spend a considerable amount of time responding to the messages of the 1200 students and their parents on top of doing my actual day job to keep up with communication demands.
YABU - get on with it, it's your job
YANBU - that's ridiculous