This is a tricky one because this sign is 1) written right-to-left, 2) using kanji for numbers, and 3) using **old** / **traditional** kanji for the numbers.
So rearranging it left-to-right and using simplified kanji would give us
> (top) []{} → Hourly Rental / Pay by-the-hour
> (right, red) [M]{} []{} → Entrance (is) 50 meters ahead
> (example in question) []{} → (Open) 24 Hrs.
> (lower left, green) []{} → Vacancy / Empty spaces availabe
* Here is a reference to kanji used for numbers.