The dollar can be used once a day. It has to be a dollar’s worth of a product, service or use of a product. For example, A dollar’s worth of a $100 TV would be the life of the TV divided by 100. You would get to enjoy the TV for that amount of time. The product or service is instant and doesn’t require any preparation. It just appears and disappears. Or you could have a TV permanently that is worth one dollar.
One dollar a day is $365 per year. If I lived a hundred years and didn’t spend anything, I’d have $36,500 (not counting leap years). I’d have to live 2,739 years to become a millionaire - I don’t think I’m going to make it!
Remember there was a guy who traded a paperclip up to a house by trading for something more valuable each time. Similar concept if you consider that the magic dollar can be sold to someone once you show them what it can do. They get it for one use but you still get one magic dollar each day.