mmmmm...delicious cheese coney...
It also means that the convention offers such a plethora of options that it is impossible to visit everything that interests you in 1 or 2 days. Therefore people are doing the 4-day trip.
Bingo. It took me 7 hours across two days just to make it through the dealer hall. Sure if I just walked and looked I could have done it in two, but that's not why I'm there. I walk, look, stop, chat, demo, get lost, back track, squirrel!, walk some more.