Gaetanomarano,

Although I have doubts about the VSE launch architecture myself, I have to say that the above calculations are completely irrelevant. Basically, to reach an orbiting outpost in LEO the launch window is 24 hours a day. That is because there is plenty of room for manouvering once you are in orbit. For instance, you could bring the CEV in a slightly higher orbit and let the LSAM catch up with you. Of course, all this takes a bit of fuel (delta-V), but I have no doubt the CEV and its booster will be designed to cope with this sort of situations.

Another thing I would like to note is that by using a SRB as first stage for the CEV booster (CLV) the total complexity of the system is drastically reduced. Most of the delays and problems we have with current big boosters come from the enormous amounts of cryogenic fuel that have to be stored and maintained. The CLV only has (relatively) small cryogenic fuel tanks in its second stage, so theoretically, it could be a pretty reliable 'easy' booster.

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