Yes, it’s a full 24 hours, but a library doesn’t use 24:00:00 to represent the last hour, it’s 23:59:59. Once it hits 24:00, it rolls over to 00:00:00.
Hence my initial error of answering 23.
It’s not valid, but I don’t edit out erronous answers because I believe all data should be preserved, no matter how dumb it makes one look.
It’s more so lucky that there was someone diligently doing that. It could’ve easily gone unnoticed had there not been someone like him.