How Long Does a Software Project Take?

What Determines the Duration

Clarity of Requirements. Not whether they are written down, but whether edge cases have been thought through. "What happens in a partial cancellation?" is the kind of question that can extend a project by weeks if it only arises during implementation.

Decision Speed. If a follow-up question regularly waits a week for a response, the project duration doubles – regardless of anything else. This is the most underestimated factor.

Third-party Systems. Each integration depends on the other party's schedule. Waiting for an interface documentation can take longer than the implementation itself.

What Does Not Significantly Determine the Duration

The number of screen masks. Twenty similar screens are built faster than five with unique logic each.

Plan Realistically

Use ranges instead of single numbers, and allocate time for things that don't appear in estimates:

• Testing by end-users
• Data migration and cleansing
• Training
• Corrections after the first real deployment

These four items account for a significant portion of the total effort and are missing from most schedules.

What You Can Accelerate

A dedicated contact person with decision authority, early identification of test users from daily operations, and willingness to limit scope. All three cost nothing and have a stronger impact than any technology decision.