Oh, it is not a problem to refresh memories :-) There may be serious problems with running so called UFO for Windows (Collector's Edition) under Windows 8 / 64bit, but the DOS version runs perfectly under DosBox, even on the newest computers.
I have just checked some of my savegames, and it appears that an alien ship stays on the ground 20,000 seconds, i.e. ca. 5 hours 30 minutes. So, there is a bug in OXC. It should set secondsRemaining to TWENTY thousand seconds while it sets it to TWO thousand seconds. The time of UFO staying on the ground should be ten times longer then (in OXC).
Please correct this...