What it looks like in a UK hospitality business
In UK hospitality they usually run one to four hours across a real service. The legal position turns on whether the person is working or being assessed: a genuinely short observation period can sit outside National Minimum Wage rules, but a candidate who is rostered, covering a section and producing work for paying customers is a worker and has to be paid. HMRC has pursued operators over exactly this, and the safe position is to pay for anything that looks like a shift.
