haha. It's very simple. In some particular situation, people use the expression like 25:00 in Japan these days.
For exsample, the schedule says like "23:00 - 25:00 : Movie". Maybe some people think that it's easier to understand that it will last 2 hours than to see "23:00 - 1:00".
It is better for you to understand the hidding meaning is that :
"we will suspend our broadcasting on early morning once as usual, but until 25:00 (1:00am) it will continue".
It seems that this kind of expression is getting wider on the opening hours of restaurant, hotels, and so on. Not a few people confused by this kind of expression at first, maybe 10 years ago, but these days people have got used to it.