Six weeks is the sweet spot. It's long enough to build something genuinely great — a real feature, a polished campaign, a meaningful body of work. But it's short enough that you can hold the whole thing in your head, make fast decisions, and stay sharp all the way to the end. Two weeks is a treadmill. Six months is a fog. Six weeks is a Mosh.

The Mosh end date doesn't move. What moves is scope. If something's taking longer than expected, the answer isn't to extend the Mosh — it's to cut scope and ship the core. This keeps teams honest about what actually matters, and prevents the slow feature-creep that kills momentum.

Between every Mosh there's a breathing period — typically 1–2 weeks. This isn't downtime, it's transition time. Wrap up loose ends. Write the retrospective. Decide what goes into the next Mosh. Good work needs white space around it. Without breathing periods, teams never fully finish anything before starting something new.

When a Mosh ends, unfinished work doesn't automatically roll into the next one. Everything goes back on the table. This forces a real question: is this work still worth doing? If it is, you bet on it again in the next Mosh. If it isn't, you saved yourself from zombie work that drains energy without ever shipping.

The Mosh builds on the Shape Up methodology pioneered by Basecamp. Shape Up introduced the idea that great software teams don't run endless sprints — they work in focused cycles with real appetite, real deadlines, and real decisions about scope. We took that core idea and shaped it (pun intended) into something that works for design, strategy, and consulting work — not just software. Same philosophy. Different arena.