No? Everyone would get the same amount, and then the people working 40h would get more than the people not doing anything.

Absolutely not. Our current system is closer to that because you lose benefits as your income increases, to the point where in some case it's possible to get a raise and end up worse off. With UBI (assuming it replaces most means-tested benefits), you're always better off earning more.

Why do you think the word "universal" is in the phrase "universal basic income"?