Well, maybe not 2 days of continuous play, but I didn't reload the game to avoid some other problems we had reported.

SE report, debug file, and prefs.ini sent to Scott.
---- SE report ----
Stardock SmartException Logging Information
-------------------------------------------

OS Version : Windows XP
Video Card : Intel(R) 82865G Graphics Controller
Application Exception code: C0000005 ACCESS_VIOLATION
Crash Addr: 0063B441 01:0023A441 C:\My stuff\Stardock\GalCiv2\GalCiv2.exe

Processor Registers (x86):
EAX:00000000
EBX:11BBA7E4
ECX:00000000
EDX:00000000
ESI:11BBA548
EDI:00000000
CS:EIP:001B:0063B441
SS:ESP:0023:0012FCF8 EBP:00000000
DS:0023 ES:0023 FS:003B GS:0000
Flags:00010246


Current Application Call Stack:

Addr Frame Logical addr Module Name
---------------------------------------------
0063B441 00000000 0001:0023A441 C:\My stuff\Stardock\GalCiv2\GalCiv2.exe