That's not the spirit of the 4HWW. The idea is to make a product that requires not much improvement, and people just buy it from your website, so essentially your 4 hours are spent doing accounting and basic customer support. You might have a part time guy to do server maintenance but that's about it. So essentially most of your revenue is profit for yourself, and you can run a "small" business with revenue in the 50-100K range.

If you start hiring full time workers, then your business has to scale a lot. Like revenue has to go to 500-1M range so you have enough to pay full time workers as well as money for yourself. That's just a completely different beast.