When you start an Expedition, you can invite all of your in-game friends to join, and up to 5 invites can be sent at the same time; you will be able to invite the rest of them after each set of invitations.
You can also join the Expeditions of your friends, for a maximum of 5 Expeditions per day.
How many friends can I invite to my Expeditions?
Last Updated: 461d