IMO, that is a bit vague. Sure, keeping descriptions short is nice, but I still don’t consider it implying it needs to be within such a short timeframe (how short is of course depending on pure chance, with the way it works). “Dominate” gave me the impression of simply pwning 4 forums, phrased that way because they were really dominated, since you did 4 in a single day. Well, anyway, that’s just my oppinion.

*Edit* At once is also a bit vague if you didn’t get the general idea in the first place, since there technically isn’t any way to *really* pwn them all at once, being a day-by-day and turn-based game. So I just thought “Hey, at once probably means in one day then, being a daily played game”. But again, that’s my oppinion.