Timeline & Process

How to Estimate Outsourcing Development Timelines -- With Milestone Examples

A guide on how to accurately estimate software outsourcing development timelines, with milestone-based scheduling examples.

Son Yeongeun · Freesi·2026-02-17 Updated

Summary in 3 Lines

•Timelines are calculated as "screen count x complexity + integrations + QA."
•MVPs typically take 4-8 weeks; production-grade products take 3-6 months.
•Frequent requirement changes can extend the timeline by 2-3x.

Factors That Determine Development Timelines

Feature Complexity: Simple CRUD takes 1-2 days per screen; complex logic (payments/notifications/analytics) takes 3-7 days

Number of Integrations: Each external API adds 1-3 extra days

Whether Design Work Is Included: Including design adds 2-4 weeks for the planning and design phase

QA and Testing Scope: Allocating 20-30% of development time for QA is the safe approach

Communication Frequency: Weekly meetings can extend timelines by 1.5x due to decision-making delays

Wondering what your project would cost by these standards? check in 30 seconds

Milestone Schedule Example (6-Week MVP)

Phase	Duration	Deliverables
Planning & Requirements Finalization	1 week	Screen list, feature specification, IA
Design (DB/API/Screens)	1 week	ERD, API spec, wireframes
Frontend Development	2 weeks	Screen implementation, API integration
Backend Development	2 weeks (parallel with frontend)	API development, database setup
Integration Testing & QA	1 week	Test report, bug fixes
Deployment & Handover	0.5 weeks	Production server deployment, deliverables handover

In practice, it is safe to include a 1-2 week buffer for planning changes, feedback iterations, and unexpected technical issues.

Curious how a project like this actually goes?

See real cases and reviews of similar work first.

View real cases →

Top 5 Risk Factors That Extend Timelines

1. Requirement Changes: Adding or modifying features mid-development may require redesigning from scratch

2. Feedback Delays: Delayed client reviews and approvals push the schedule back accordingly

3. Underestimating Permission/Authentication Complexity: Login and permission systems require more effort than they appear to

4. External Integration Variables: Delays caused by insufficient API documentation or unavailable test environments from third parties

5. Skipping QA: Skipping testing leads to post-deployment bug fixes that ultimately take even longer

Timeline Estimation Checklist

Total number of screens (pages) confirmedComplexity classification for each screen (simple/moderate/complex)External integration list and difficulty level for eachWhether design assets will be provided (if not, add 2-4 weeks)QA period secured (20-30% of development time)Client feedback cycle agreed uponBuffer period included (recommended: 15-20% of total)

Wondering what your project would cost?

Enter your requirements and see a quote range in 30 seconds — based on real project prices. No sales calls.

What would you like built?

Pick the closest one and your estimate appears right away.

Crawling / Data Collection Task Automation Website / Web App API Development / Integration Chatbot / AI Maintenance / Fixes Other

Free, no sign-up, and we will not call you.

Or browse the fixed-price menu.

Frequently Asked Questions

What kind of project can be completed in 2 weeks?

Simple CRUD apps with 5 or fewer screens, landing pages, or basic admin dashboards can be completed within 2 weeks -- provided there are no external integrations and design assets are already provided.

How can I prevent the timeline from constantly growing during development?

1) Finalize requirements in writing before starting, 2) agree on additional timeline and cost implications for any change requests in advance, and 3) receive progress updates 1-2 times per week.