Hello, it seems that I've encountered an interesting bug. I was in disbelief at first, but I think it boils down to the game judging the trading time based on the system clock.
Basically, I started a trade and shutdown my computer. Now, for some reason I haven't been able to permanently keep my system clock on the same time zone on restart (instead, I have to sync it manually to a server). So, I decided not to sync my clock and rebooted my computer to find that the game had extended my trade time by 7 hours! I have included a screenshot.
EDIT: Of course, while in game, if I decide to try to sync my clock again, the game will freeze and requires a re-connect.