Adding to the data. We ran through the first mission in right around 3 hours. That was with 2 of us. I imagine it could fluctuate depending on the number of people. More time for debating, but potentially less time for making more optimal decisions from the hivemind.
I feel like the second mission (Marcy Files) took around the same. We played a couple hours with 4 people, but we had to call it a night. Then we came back with 3 of us (4th wasn’t likely to make it any time soon) and finished it in another hour or so probably.
p.s. I absolutely love, love, love the game. I can’t wait to get the third mission, but my local game store still doesn’t have a street date for it yet.