Barn Swallow help, please.

[MadPansy64]

Making them relocate away from my front porch, to be precise.

While I like birds, I could do without the hysterical swooping and hair pulling. GiantFreakin Marine doesn't find it at all charming.

I don't want to kill the babies, so I am *really* hoping that I can just knock down the nest after they fly, and before batch #2 is laid. Any chance of that? There is a big old barn not 100 yards away, as well as other outbuildings. They won't be homeless, if they just look around a bit.

I'm reasonably sure hatching began today -- quiet yesterday, cheeping at any movement began this morning. How long before they fly the nest? How many nests to swallows lay each summer?

I did google, but most of the sites are concerned with attracting swallows, rather than time frames for evictions.