Oh please tell me it's possible, I swear I will play X3 24/24 (Well... I'll try 18/24 first) Furthermore, my girlfriend think that the missions deadlines are too short too, so make two happy souls !
Hmmm, I'm not a scripter but I think it could be possible to alter them. If they are written with the MD, I don't see why you can't just open the xml file in an editor and remove the time limit.
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From the darkness you must fall
Starting to mod? Watch my ship importing tutorial here here!
Test this Mod out and let me know if it works. Should give you 100 times the amount of time on Assassinate missions. Be sure you're on an Assassinate and not some other type. Extract it to Mods directory and select mod from initial X3 menu.