“How long will this take?” is the first question in almost every discovery call we have. It’s also the question most development firms answer incorrectly — either too optimistically to win the deal, or with so many caveats it’s useless.
Here’s an honest answer.
The short answer by project type
| Project type | Typical timeline |
|---|---|
| API / backend service (focused scope) | 3–6 weeks |
| Web application (defined scope) | 6–12 weeks |
| Mobile app (iOS + Android, cross-platform) | 8–16 weeks |
| SaaS platform with auth, billing, multi-tenancy | 12–24 weeks |
| Enterprise integration (ERP/HRIS/SSO) | 4–10 weeks |
| Full platform (web + mobile + API + infra) | 20–36 weeks |
These assume a clearly scoped brief, senior practitioners, and a client who can review and approve within 48–72 hours of each milestone.
What actually determines timeline
1. Scope clarity at kickoff
The single biggest driver of timeline is how well-defined the requirements are before work begins. A vague brief means discovery takes longer, architecture changes mid-build, and features get added after spec sign-off.
A written spec with defined acceptance criteria per feature — signed before development starts — is the most effective way to compress timeline. This is why our proposals include written acceptance criteria before any code is written.
2. Integration complexity
A standalone application with no external integrations is significantly faster to build than one that connects to legacy ERP systems, custom internal APIs, or third-party services with poor documentation.
Every external integration adds 1–3 weeks of effort depending on API quality, authentication complexity, and data volume. If your project has five integrations, that’s 5–15 weeks of integration work alone.
3. Client review velocity
The fastest builds we’ve shipped moved quickly because the client’s stakeholders were available, gave clear feedback, and approved milestones within 24–48 hours.
The slowest builds stalled because approvals required committee sign-off, stakeholders were unavailable during testing, or feedback arrived weeks after delivery. Timeline is a shared responsibility.
4. Infrastructure and security requirements
An application that must pass internal security review, penetration testing, and compliance certification before production deployment adds 2–6 weeks to the end of the project.
If security review is required, scope it in from day one — not as an afterthought at the end.
5. Design maturity
Starting development from complete, approved designs is materially faster than designing and building in parallel. If designs are incomplete or change frequently, build timelines extend.
Common causes of slippage
Scope creep mid-project. Features that weren’t in the original spec get added without a formal change request. Each addition looks small individually but accumulates.
Late stakeholder involvement. The people who have final approval on the product join the review process in the last two weeks — and request changes that require rebuilding finished work.
Integration surprises. A third-party API behaves differently from its documentation, or an internal legacy system has undocumented constraints discovered during integration.
Review bottlenecks. Approval cycles that take weeks rather than days.
The most reliable way to prevent slippage is: scope in writing before you build, change control for anything outside the scope, and weekly demos so no surprises accumulate until the end.
How we structure timelines at Thejands
Every engagement starts with a written proposal that includes:
- A defined scope with feature list and acceptance criteria
- A milestone schedule with weeks and deliverables
- An explicit change request process with impact on timeline and cost
- A 30-day stabilisation window post-launch
If a milestone slips, we flag it the moment we see the risk — not on the day of the missed deadline. That’s the difference between a managed delay and a surprise.
If you have a project in mind and want a realistic timeline before committing to anything, book a discovery call — we’ll tell you what we can deliver and when, in writing.