This is why it's good to have a ticketing system. At first, just create tickets yourself for the ad-hoc work (but make it visible to the requestor). I do this f

This is why it's good to have a ticketing system. At first, just create tickets yourself for the ad-hoc work (but make it visible to the requestor). I do this for anything that takes more than an hour or so, or for even miniscule tasks if it's a particularly busy time (just to keep track of everything). If it's a larger request, then you can say "Sure, I'll fix it, but i'll have to stop working on TICKET-1234, is that OK?" Eventually people learn to create and prioritize their own tickets. This is also good because sometimes a "five minute" fix can turn into a huge project because of unanticipated factors.