I'm real positive that ABC used to run Grey's Anatomy 5-10 minutes long, so even if all clocks were synchronized, the default 3-minute late timer setting wouldn't help. Also, the guide data said it ended at 10:00pm, not 10:05pm or 10:10pm. Before that, and it's been quite a while back that I'm not as confident, I think ER on NBC had non-standard start/end times. Heh, that was pre-DVR days, in fact !! Probably back in the days when I recorded ER, Friends, etc for my wife when she was working 2nd shift.