How much time does Young Founder take each week?

Two different numbers, and conflating them is how families end up surprised.

The reading and the workbook take about an hour a week. One chapter of the novel, then the matching workbook chapter where your kid works on their own business rather than reading about somebody else's. That part is predictable, it is the same every week, and an hour covers it comfortably.

The business takes longer, and it varies enormously. That is not a hedge, it is the actual product. Your kid is launching something real, and real work does not fit in a fixed box. A kid with two lawns spends a couple of hours on a Saturday. A kid with eight spends most of it.

The shape across the ninety days is roughly this. The early weeks are light, because choosing an idea and testing whether anybody wants it is mostly thinking and a few conversations. The middle weeks are the heaviest, because that is when customers arrive and the work is new and slow. By the later weeks a kid is faster at the same jobs and it settles down.

One thing worth planning around: this is not homework that can be batched on a Sunday night. The asking part has to happen when people are home to answer a door, which in practice means weekend mornings and early evenings. That is the scheduling constraint families actually feel, more than the total hours.

If the total starts crowding out school or the household, that is a business problem with business answers rather than a reason to cut back. Fewer customers at a higher price earns the same money in less time, and customers who live close together turn four trips into one.

The one honest caveat: a kid who is genuinely enjoying it will go well past any of this, and the parent problem at that point is the opposite of the one you were expecting.