how much does round 2 and 3 vary? also pref

It's hard to give you specifics but there will be girls released tonight and there will be girls that drop tomorrow after receiving their invites. If you are invited back to prefs you should receive a bid even if you have one house left. If you have more than one house at prefs, you should receive a bid AS LONG as you maximize your options. Maximizing options means you do not suicide. If you suicide, you may not receive a bid at all.

If you have 2 or 3 houses at pref, you could receive a bid to any house. Let's say your 3 in your order of preference are A, B, then C. The computer will look at As list first and if you are high ranked on it, you should recurve a bid to A. If not, the computer will look at Bs list and so on.