Why Assignment Length Matters in Recruitment

For staffing agencies, assignment length directly determines revenue duration. A 13-week contract that converts to a permanent role after week 8 cuts five weeks of billing from the forecast. A 26-week assignment that extends twice doubles the projected revenue from a single placement without additional sourcing cost. Tracking average assignment length by client, sector, and role type is foundational to accurate revenue forecasting and to understanding where margin leaks through early termination.

Beyond billing, assignment length shapes the candidate experience and the agency's ability to retain qualified workers. Contractors who repeatedly receive short-notice end dates develop a preference for direct clients or competitors who can offer more predictable tenure. Agencies that can consistently match candidates to assignments where length expectations are honest and honoured build a reputation advantage in markets where the same workers circulate across multiple providers.

How Assignment Length Works

Assignment length is the agreed duration of a temporary, contract, or interim placement from start date to scheduled end date. It appears on the work order, the candidate's contract, and the client's purchase order, and it governs billing authorisation, benefits eligibility thresholds, and notice obligations. Actual assignment length may differ from scheduled length due to early termination, extension, or conversion to permanent employment.

In practice, assignment length varies significantly by sector and role type. Light industrial and logistics placements often run 4-12 weeks, tied to project cycles or seasonal demand. Professional and technical contracts typically run 6-24 months, governed by project phase gates or budget periods. Executive interim assignments can run 3-18 months depending on the transformation or transition being managed.

The mechanics of extension matter operationally. Most staffing contracts require written authorisation before an assignment can extend beyond its scheduled end date. Agencies that do not have a proactive extension tracking process will find workers either continuing without proper authorisation, creating payroll and liability exposure, or being terminated because no one triggered the extension conversation in time. A recruiter managing a portfolio of 40 active contractors typically needs a 30-day rolling alert system to flag assignments approaching their end dates and prompt client conversations before the default outcome, which is termination, is allowed to happen by inertia.

Assignment Length vs Contract Term

Contract term refers to the duration of the commercial agreement between the staffing agency and the client, which may cover multiple assignments or a master vendor relationship. Assignment length is the duration of a specific worker placement within that commercial relationship. A client might have a two-year master vendor agreement (the contract term) through which they run 40 individual assignments of varying lengths. Conflating the two can create forecasting errors, particularly when a master agreement is renewed but individual assignment volumes or durations shift.

Assignment Length in Practice

A delivery manager at a technology staffing agency manages a portfolio of 22 active contractors placed at a financial services client running a core banking migration project. The project is structured in three phases, each with defined milestones, and assignment lengths were set to align with phase completion. As Phase 2 nears its scheduled end, the manager runs an extension review six weeks out, confirms which roles are needed in Phase 3, and renegotiates 17 extensions with an average length increase of 14 weeks. The agency's quarterly revenue forecast improves by £340,000 from extensions that would otherwise have been missed without a proactive tracking system.