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mashton-
It depends on how much work it needs and what they are using to do it. Most times I sharpen a kitchen knife it takes a few seconds, I don't wait till they need regrinding.
If I need to use a stone and oil it takes a while to get the stone, get the oil and lube the stone, but it only takes a moment to put an edge back on.
If they have a workshop set up to do it, and people coming in regularly, and the skills then two minutes is easy!
adroit
I found these guys a while back
http://londonsharpeningservice.co.uk/domestic-service/
You're welcome to have a go on our Robert Welch knives. I do keep them sharpened and honed but they are likely due something more serious.