You’ll be able to do a 24hr+ cook with one load of charcoal in a Komodo if it is anything like an Egg. If you do it right. Might have to give the coals a stir once or twice.
Did my first Boston Butt on my birthday present ( http://www.homebrewersassociation.org/forum/index.php?topic=165.msg194561#msg194561 ) this weekend and wow, just wow! Took forever but the taste was something else.