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Rather than taking a view across 24 hours, we could calculate the work done by an advisor working a 37.5 hour week.

In this case, the calculation would be:

Agents(80%, 30, 20,000 / 37.5, 330) x 37.5

That is, the number of advisors required per hour in a rota multiplied by the number of hours in a rota.

This calculation gives 2,063 call-taking hours required, almost half-way between our first calculation and what the accountant expected.

The problem with this is that it effectively “squashes” volume up in the calculation, leading to a lower expectation of required availability.  Such under-cutting will lead to insufficient staffing to deliver the service level unless the opening hours of the centre are actually 37.5 hours per week.