I think it's common sense that the title was chosen for marketing reasons, not as a factual description. (iirc He even talks about testing titles for the book in the book)
I do believe there could be weeks where it's only 4 hours of maintenance. But no one in their right mind believes they can build an asset base of recurring income sufficient for living on 4 hours of total effort per week. The real message of the book was about arbitrage. Geo arbitrage to live somewhere that costs 1/2 the price to work 1/2 as many hours. Eliminate the "80%" of the low value work. Use the same arbitrage to outsource the remaining low value/low skill work. Only do the high value hours yourself.
I do believe there could be weeks where it's only 4 hours of maintenance. But no one in their right mind believes they can build an asset base of recurring income sufficient for living on 4 hours of total effort per week. The real message of the book was about arbitrage. Geo arbitrage to live somewhere that costs 1/2 the price to work 1/2 as many hours. Eliminate the "80%" of the low value work. Use the same arbitrage to outsource the remaining low value/low skill work. Only do the high value hours yourself.
That's the idea at least.