How long does an AI SaaS MVP actually take?

What the weeks actually contain

• Week 1 — skeleton that works: project scaffolding, auth, data model, the core AI workflow's first end-to-end pass. Ugly but running. If you can't demo something by end of week 1, the scope is wrong.
• Week 2 — the real workflow: the AI feature shaped into something a stranger can use without instructions. Billing model wired (plans, credits, or packs — decided here, not later).
• Week 3 — money and deploy: checkout live against a payment provider, webhooks delivering what customers paid for, deployed on a real domain, the boring parts done (backups, error handling, email).
• Week 4 — buffer, polish, first users: the week you'll be glad exists. Fixes from the first real users land here.

A 2-week MVP is weeks 1–3 compressed: one workflow, one user type, one billing model, everything else explicitly out of scope. It works when the scope call has already been made — see what an AI SaaS MVP costs for what fits in that box.

What honestly stretches timelines

• Undecided product. "Let's figure it out as we build" is the single largest multiplier — every open decision becomes a mid-build negotiation.
• Integrations breadth. One AI workflow is a week; five (chat + generation + analysis + exports + notifications) multiply build and test surface.
• Multi-platform. Web + mobile roughly doubles front-end work. Web-first is usually the right MVP call.
• "Just one more feature." Scope additions during build don't add linearly — they re-test everything they touch. Fixed scope + a v2 list is how you ship on time.

Red flags in any timeline promise

• "48 hours to a full SaaS" — that's a template with your logo, not a product; the billing/auth/deploy half is where the time actually goes.
• No weekly demo in the plan — if you can't see running software every week, the timeline is a hope, not a plan.
• No explicit out-of-scope list — unspecified edges become the delay.

How to keep yours on the short end

• Come with references ("like X but for Y") — scoping accelerates dramatically.
• Decide the billing model before week 2; it shapes the data model underneath everything.
• Accept that v1 excludes things. A shipped v1 that takes payments beats a perfect v1 that doesn't exist.