Most teams overbuild the first version. We start from the single loop that has to feel great, get it in front of real users in week one, and expand from evidence rather than opinions.
Week 1 is a working prototype of the core interaction. Weeks 2–4 are the surrounding flows, instrumentation and polish. Weeks 5–6 are hardening, store prep and launch. The result is a product you can actually put in front of paying users — not a demo.