From what I have read there is rarely a fixed number. They look at consistency and what you took from it more than raw hours. A long shallow list looks worse than a few things you stuck with and can talk about deeply.

Two things. First, grades alone don’t get anyone in anymore. Admissions committees look hard at what you did beyond the marks, the extra courses, the volunteering, the training events you actually showed up to. Structured hands-on courses like ours give you a signed certificate and logged extracurricular medical training hours you can put on an application, which genuinely helps when real shadowing is hard to come by. Second, stop chasing a magic number. An interviewer can smell hour-padding. What they want is a story. You did a thing, it changed how you think, here is how. One honest, well-understood experience beats fifty box-ticking ones.

Just went through my own interviews: not one person counted my hours. They asked what I learned from the things I did. Depth, every time.

Same from the US side. My advisor drills depth over hours too. I logged a pile of shadowing and the interviewers only asked about the two experiences I actually cared about. Quality wins.