According to U$.$S$.$ federal law, how much vacation time must be provided to workers?

In the United States, employers must give the amount of paid vacation that makes economic sense.

In the United States, employers must give employees $10$ paid vacation days each year.

U$.$S$.$ law requires that new employees receive $25$ or $30$ days off.

U$.$S$.$ law lets employers decide on paid time off; there is no minimum.