That was a bad time for me too. But I had quite a few good games (well, easy ones) fighting against nooblets, when somehow a guy that I played with during beta joined in and recognized me (never friend requested or anything), and we squaded up for quite some time, destroying the other team.
Rush maps can drag on for ages, if the teams are balanced. But if its lop-sided, I have seen it ending in less than 3 minutes. We were lulzing that it was shortest game evar~.
But I have a record of 45 second round end in BF2142, so I don't think its hard to beat that. And its conquest mode too. Well, conquest assault to be more specific.