Share your insights or perspective on the financial matter presented in the input.

Do banks give us interest even for the money that we only had briefly in our account?
The other answers demonstrate that you'll receive a paltry amount of money in two days, by comparing to things like wages, the cost of electricity, etc. But the real point is you're incurring risk by paying late, in particular, the realistic risk of the post office messing up. That's not worth it, and it's this kind of overhead that people usually mess up when trying to optimize their finances. (More commonly, it's "I can save 5 cents by doing this, but there's about a 400% chance I'm going to mess everything else up since I don't have infinite mental bandwidth). You asked a good and important question, but for your actual situation I must emphasize it's terrible personal finance to risk dropping your books for a superficial optimization.