Complete beginner
If you have never driven, plan on a full progression. WMST built the 9-hour package for exactly this: it takes you from your first time behind the wheel through the maneuvers on the skills test, and it includes the test itself. Most true beginners are ready by the end of it. You are not buying a fixed number out of thin air, you are buying a path from zero to licensed.
Rusty or partly experienced
If you have driven a bit, in another country, years ago, or just informally, three to five hours is a common sweet spot. Enough to fix bad habits, learn the local rules, and drill the test maneuvers, without paying for lessons you do not need. The 3-hour and 5-hour packages cover this.
Just need to pass the test
If you can drive and just want to nail the skills test, one or two focused hours often does it. We spend the time on parallel parking, backing around a corner, hill parking, and the observation habits examiners score. Pair it with a test-day warm-up and you walk in calm.