From a Gamemaster point of view the Missions have always been great, though in this one there is a lot of room for things to go wrong. What I mean is some of the situations might "turn off" runners, and cause them to do things that will end it rather abruptly.
When we ran it it was over in 2 hours just by making one choice, and while the Mission was successful by the adventure's standards, not exploring some less luring options left us playing another scenario that evening.
So I would say (based on our group having 8 players) it can go anywhere from 2 to 4 hours, and we will continue to play the Missions as they have been a great way to learn other aspects of the game you may not even know you aren't familiar with.
[4 of 5 Stars!]