Does stir-fry timing actually hold up when you include prep?

Stir-fries get listed as quick weeknight meals pretty consistently, but I keep wondering whether the clock starts at a clean, prepped mise en place or at the moment you pull vegetables out of the fridge. The cooking itself is genuinely fast, but the chopping can quietly add fifteen minutes that never show up in the official total time. Curious whether people count those minutes or treat them as separate.