I agree with @Morgi My experience has also been from the range of 1 hour all the way up to 11 hours. The longer troops are rare. Most of the time you'll have a good idea with the parameters of the troop being established in the announcement of the troop. However, troops like parades can through you wild cards. My longest troops while kitted have been parades or sporting events. These days my longest troops tend to be the 2 hours range. I've been working on ideas and hacks for surviving the longer troops and noting them with this thread. And yes, access to water is the key. I've got emergency water bottles galore in my tub, but it's good to get a lay of the land when you get to a troop to see where you can get water or have water stored.