GMs who have run parties through "Takeover at Whisper Base," how long did it take you? Did you do the whole module in one session or two?

I've run it a couple times at Con settings and have always finished before the four hour limit. I'd say 3 to 4 hours.

Perfect, thank you!

I fleshed it out a bit. Started with the PCs landing on Onderon with the contact (Rebel Sympathiser Barkeeper of a Local Cantina), so they could gather some Infos and plan the Attack rather of starting right at the front gate, so it took 2 sessions. If you run it by the book, it is about 3-4h.