pass duration

hello
We arrived in Japan on July 19th, we bought the 7-day JR PASS. We will activate it on the 19th at the airport. Will it be valid until July 25th, until the end of the day or until the time we activated on July 19th?

I have doubts because I would like to use the last day (July 25th) to go to Mount Fuji.

Thanks for listening