Tokyo and Osaka trip

Hi,

I am travelling to Japan for the first time and feel very confusing about the JR pass and not sure if I should get the 7 days or 14 days pass, could you please kindly give me some advise? Thanks

Day 1 – Narita Airport to Tokyo
Day 2 – Tokyo – Disneyland - Tokyo
Day 3 – Tokyo – Disney sea – Tokyo
Day 3 – Tokyo to Mount Fuji
Day 4 – Mount Fuji
Day 5 – Mount Fuji to Osaka
Day 6 – Osaka - local
Day 7 – Osaka - local
Day 8 – Osaka - local
Day 9 – Osaka to Tokyo
Day 10 – Tokyo - local
Day 11 – Tokyo – Tokyo Odaiba Oedo Onsen Monogatari - Tokyo
Day 12 – Tokyo – Narita Airport