one thing that hasn't been said; if you're done with a cigar, lay it down and be done with it! i absolutely love falling into the zone with a cigar, burning it as far down as i can, and taking the experience for everything it is worth. BUT. sometimes i am good with it, no longer emotionally invested, and don't quite make it to the band. had my fun, set it aside, and go on with my life. it's not a waste if i enjoyed it, even if i had "plenty left". if this happens a lot, as it seems to be on your side, start looking at smaller options, save the churchills for those rare few times you have two or more hours. o)
also, completely agree with the guys so far on burn time. i have seen some of the burn times listed on some sites, and thought "are those guys high?!?". i block out at least an hour and a quarter for a robo or CG, and an hour at least for a mareva or under.