How many days do we have to schedule for both Tokyo and Osaka to travel?

pu1. I think it would be nice to stay for at least 5 nights and 6 days
First of all, I think it's similar to traveling in Korea, but Japan is far away and transportation costs are very expensive
If you take the Shinkansen, it's over 120,000 won

2018-01-26

OK

pu2. I don't think I can do both
I think it'd be good to set up a separate schedule and go twice or look around for two to three weeks

2018-01-26

OK