Hi zaphod, welcome
Just a note on the prewritten adventures - I’ve run Small Fry at Conventions and it is actually hard to get through in four hours (but I do) - especially if you use any tactical maps, or roleplay the opening investigation with any depth.
Ghost in the Machine is a shorter adventure, I'd say two hours if you gloss through it, but I'm running that at a convention too, scheduled time four hours. To pull it off, I plan to heavy roleplay the 'haunting' scenes, and allow for some ship boarding combat after the initial space combat at the end of the adventure. I also make use of tactical maps, which always slows the game down, but I feel adds some nifty depth as well.
The third adventure (Operation Ape) could easily take six hours (it is huge) - again, I'm running at the conventions for four hours with minor tweaks.
Did Somebody Say Zombies, is a little shorter, but still three to four hours of good gaming.
Fortune Cookie Fix is easily the longest, you could spend eight hours on it (but again, with minor tweaks, we got someone running it at GenCon in a four hour block.
Velociraptor Rhapsody, just fits in a four hour block as well.
And of course, these adventures are already written - just waiting for the art and layout type things that will allow us to make them available to the public...
Oh, and I realy dig the screen name - pan galactic gargle blaster anyone?
BZ