I frequently receive emailed requests on days I don't work. This could be work for a student who will be absent, data analysis or something similar. Sometimes these require me to respond to on my days off. I have been sent a few emails about not completing these tasks in time from my line manager, for which I have apologised, but also pointed out that if I am sent emails on the days I am off, and have to respond before I am next at work, then I can't oblige and shouldn't be expected to. Does anybody have any constructive advice for dealing with this?