You'd just need - or, well, "just" need - people with the skill available and a setting where a handful of Travelers disappearing won't be an issue.

[And for that handful of Travelers to be able to behave themselves - or at least not be prone to things like picking a fight with an ocean - but Sabetha knows that already.]

Do you know if there's an upper limit on how long you can be gone, or was that not something you had a chance to test?