I’m Happy & excited

Denmark / Norway

2 people arriving in Copenhagen (different dates) traveling together from Copenhagen / up to and through Norway (some ferry possible) mid-June. 1 person returns to Copenhagen to fly back to States. 1 person stays 1 month longer to return to Copenhagen to fly back end of July.
1 person staying longer may also go from Copenhagen down to Germany and then back up to Copenhagen to pick up 2nd traveler for the Copenhagen / Norway portion of trip.
How many days recommended to thoroughly cover Copenhagen / Norway (up & down, including Flam railroad) with 2 person 15% discount?
Should person with more time buy a separate pass for Copenhagen / Germany or individual tickets ???
1 person has
this question