7 day or 14 day JR Pass?

Hi there,
Happy new year and hope you can help me with the question below:

I’ll be travelling to Japan in January & would be glad if you could kindly assist to advise how many days JR Pass is recommended for my itinerary.

Day 1- Arrive at Narita International Airport to Tokyo
Day 2 - Tokyo
Day 3-5 - Hokkaido
Day 6 - Traveling from Hokkaido to Tokyo
Day 7 - Mount Fuij
Day 8 - Osaka
Day 9 - Kyoto
Day 10 - Tokyo
Day 11- Nakone
Day 12 - Tokyo
Day 13 - Narita International Airport

Should I get a 7 day JR pass or a 14 day JR pass? Your kind assistance will be much appreciated.

Best Regards,
Erica