I do some work for a charity board - think clerking for school governors, although not that.
I am employed (ie not SE) and have an annualised hours contract, which equates to about 10 hours per week. Some weeks I will be very busy and work most days, then several weeks with no work.
All the meetings are planned in advance, with dates for papers known and reminders sent well in advance. One week before meetings I upload papers to a system that means all members can review them ahead of the meeting.
Some people are always late and expect me to "just" upload them when I receive them.
It's not a big job, but it takes longer than you'd think when you have to set up the lap top, deal with two factor authentication, re format papers etc and it's not good use of my time to do it just for one paper.
I plan my time to work on the date the things are due, on the other days I'm not thinking about work at all. Strangely, this working pattern suits me becuase I have other things to do with my time.
So, for example, there is a meeting next Tues. I have some papers but not all. I'll upload what I have and send a message saying the missing ones will be added once received. However, I have no planned work now until Monday, so would it be unreasonable to do it then?
I am busy, in that I have plans between now and then, but I could find time to get it done if I had to, I just don't like the way this "little" PT job expands when I have to keep logging on to do one short task, or the way I have to keep checking emails to see if it's ready.