How much porn is too much ?

As a male who enjoys pornography the internet it is a fantastic release for sexual frustration and full of lots of great erotic things to see. However i am spending too much time masturbating watching videos. Is this a guy thing only? How much is too much? I see an attractive woman and I sometimes get home and find a video that reflects what I saw eg redhead in tight dress, and am playing with my 8" toy for hours. Smartphones make it even easier. Help !