not sure about all night but deffo in the early hours. I was attacked really nastily at 6am one morning...not a joke i mean real horrible stuff, I reported it and it was pulled within a minute of m report.
"On duty" is perhaps wishful thinking, Anne! As I understand it, mods flit in and out of AB just like the rest of us - they get no recompense for being mods, so there's no rota per se...
Payment would come in the form of something found on my desk once a month. For example, I could offer you a calendar from last year or a Christmas decoration which has yet to find a home.
I prefer the out-of-the-kindness-of-your-heart thing though :)