"It is illegal to hold more than two sessions of bingo per week, and those sessions may not exceed 5 hours each session." Link
There are all kinds of remarkably dumb laws still "on the books," and there are plenty of laws that are just so trivial and dumb that it is funny and surprising, like this one! Dumb bingo law, you make us laugh.
You might also want to check out this dumb California law or this dumb Tennessee law! If you just can't get enough of dumb laws, have a look at these!