At minimum, you need three people to launch the balloon:
It is helpful to have a fourth to read off the handy Balloon Launch Checklist that Aether Industries includes with their Balloon Inflation Tube & Scale.
You only need two people to recover the balloon (because you should never go alone — safety first!), so if some launch crew members need to leave before recovery, that's okay. But recovery is the most exciting part!
Since it is usually a long drive out to the launch and recovery site, we try to make a fun day of it, with our post-launch celebratory orange juice and post-recovery snack and picture-viewing party.
|Post-launch celebratory OJ!
|Post-recovery ice cream and picture viewing.