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@Tupp_ed Yes. The mathematics of this is called Queueing Theory. You need "spare" resources to stop the queue growing. I don't have a link to the source, so take this with a grain of salt, but a few years ago a colleague demonstrated this with public health in the UK; there were 43 vets checking out Brit cow herds at 100% "efficiency". They needed 3 more to avoid a backlog growing. The result was billions of pounds wasted because they didn't stop mad cow disease in time.