English to French Other Human Resources Term used in a consulting bonus plan

“Billable Utilization” is defined as: [actual billable time (in hours) plus any pre-approved training time (in hours)] divided by [(total available business days minus Holidays) multiplied by 8 hours per day].

Is there an existing term to refer to "utilization" (e.g. resource utilization) in general, and would you just use "utilisation facturable" with the given definition?

Here is a definition I found online in the following document (http://www.openair.com/home/OpenAirWhitePaper-CalculatingUti...

Level Two: Billable Utilization The next level is “billable utilization,” which measures the time your resources spend working on billable projects and tasks. The time spent on internal projects or business development is not included, since this time is not billed to the client. Billable utilization is almost always less than resource utilization, which includes hours spent on internal projects and business development. For instance, a resource might be 90% utilized overall (resource utilization), but because not all time was billed back to the client, billable utilization might be closer to 70%.