The Expedition window in ARC Raiders is open for 5 days per cycle. From the official event details and community breakdowns for the first Expedition, the departure window ran from December 17 to December 22 (5 calendar days) , during which players could choose to commit to the Expedition before everyone who signed up departed together at the end of the window. Broader guides on Expeditions also describe the structure as roughly a 60‑day prep phase followed by a short departure window of about 7 days , which in practice for the first live event was implemented as that 5‑day window.

So, when people ask “how long is the Expedition window” in ARC Raiders, they’re usually talking about a multi‑day sign‑up window of around 5 days (within an approximately week‑long final phase) where you can lock in your Expedition choice before it departs.

Quick Scoop

  • Expedition prep phase: About 60 days of gathering materials and building your caravan project.
  • Expedition window length: Commonly cited as December 17–22 for the first cycle → 5 days.
  • Design intent: Guides and previews describe it as a short, roughly week‑long departure window tacked onto the end of the 60‑day cycle.
  • If you miss it: You keep your project progress, but your Expedition (and its buffs) waits for the next cycle’s window.

In practical terms: expect a few days near the end of each Expedition cycle where you can opt in, not a single brief login-only moment.

Mini FAQ

Is it always exactly 5 days?

  • The first Expedition was clearly communicated as Dec 17–22 (5 days).
  • System descriptions talk about a “roughly seven-day window” , so future cycles may stick to about a week even if exact dates shift.

Do I lose everything if I miss the window?

  • No: your caravan/project progress is retained into the next cycle.
  • What you miss is the current departure’s buffs and rewards timing , so you wait until the next Expedition window to cash in.

Simple takeaway

If you’re planning around it, treat the Expedition window in ARC Raiders as a 5‑day sign‑up window (within a roughly week‑long final phase) at the end of a 60‑day cycle.

Information gathered from public forums or data available on the internet and portrayed here.