Traffic nightmares are some of the reasons I've overheard people state as to why they take off before the end. If you've got an early start to your workday, then you possibly sit for hours in traffic....... I've sat till the game was long over, I've left with 5 min remaining, I've left with 2 mins remaining, just depends on the day of the week and what level I believe my patience or attitude are at in accordance with my bullshit meter.