Your reference to the space shuttle prompted me
to look at a the real-world example, and ample
information about the shuttle is available online.
This example contains information from:
http://www.spaceflightnow.com/station/stage5a1/fdf/102entry.html
The three de-orbit maneuver contingency plans each
listed on the site (of which I provide the first example below)
seems to indicate that from the moment the shuttle
initiates a deorbit burn, the time is just a little
more than 1 hour. This may change based on other
factors, but you are free to continue to explore
this at your leisure.
ex. 1 (from the aforementioned website)
Rev 201 Deorbit to KSC
01:25:57AM Deorbit inginition
01:27:08AM TDRS acquistion of signal
01:28:53AM Deorbit burn complete
01:59:47AM Entry interface
02:04:42AM 77-degree left roll command
02:15:35AM 59-degree roll reversal
02:24:58AM Velocity less than mach 2.5
02:27:08AM Velocity less than mach 1
02:27:47AM Shuttle on the HAC
02:31:25AM Landing
Elapsed time in the above example, 1 hour, 5 minutes,
28 seconds.
Hope that that helps.
Regards,
Larry
"Do not meddle in the affairs of Dragons, for you are crunchy, and can be seasoned by a wide variety of tasty condiments."
"Who's your Daddy?"
[This message has been edited by DaddyDragon (edited 10 January 2002).]