Exploring the city/surrounding area is another factor, definitely. For example, I won't usually stay late on Sunday of Otakon to 'explore' in Baltimore (I'm from the Mid-Atlantic, and with family nearby there I get to go relatively often); but if I could swing a couple extra hours in NYC after NYCC, I'd be all for that.
Sleep is also a bonus factor. If you plan on doing things late at night on Saturday, make sure you're well-rested before you travel!
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