Oh, and I forgot...these times are for getting *to*
orbit...not coming from orbit. They do work for coming from orbit if you
are using a streamlined hull configuration. If, however, you are using an
airframe configuration you can air-brake on your way down to a speed of, I don't
know...say 6,000 km/h, and then de-accelerate from there. Using the
formulas in the time to orbit calculator should make this a realitively simple
matter to calculate.
(If anyone wants me to give formulas then I
will...Ive spent the last little while immersed in them and have no idea what
most people on this list know or don't know.)