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I'd just monitor it for yourself. You can't put a specific time on it. I've had more sites spidered over the years than I can remember and have never noticed a solid pattern. Well, you think you have, then you get a few sites which throw it out of the window. I've had sites spidered within a couple of hours of releasing them online, sites appearing in the serps within 48 hours and never dropping. On the other hand, i've had sites go in, drop out completely and never come back. The dropping out thing was common a couple of months ago, when G was doing its rolling update, however i've put a few sites online post florida and they've gone in at pretty rank positions and have only moved significantly up the serps once their respective PR had been assigned.
Prophet.
I add pages regularly, Google finds them fast, and over the last few months the schedule I posted is how it works. Please note that I said "about" in my post... the guy who asked isn't expecting an exact timeline, he's just trying to get a rough idea. I gave him one.
