Let's see, according to Microsoft Streets and Trips it's 18 hours of road time from Ottawa to the Argentia/North Sydney ferry, then another hour and forty minutes more to St. John's. You'll go through Montreal and Quebec, and the run from Riviere-du-Loup to North Sydney looking like a great motorcycle road.
The times work out:
Day 1
Fly to Ottawa, get bike.
Day 2
Shakedown ride in and around Ottawa, final visit to dealer & thence to Montreal.
Day 3
Montreal
Day 4
Quebec
It's just under three hours from Montreal to Quebec so you'll have a full day of sightseeing whether you sleep in Montreal and get an early start, stop somewhere cheap in between, or finish day 3 going to Quebec.
Day 5
If you leave from Quebec, it's 13 road hours to North Sydney. Be smart, ride a few hours from Quebec at the end of Day 4 so you can enjoy a great day's ride!
Day 6
Ferry ride, then two hours ride home!
I think I just worked out a great vacation loop ride starting in Ottawa or Montreal! One leg to St. John's, then to Halifax, Yarmouth and back. About 40 road hours, plus whatever time you want to spend riding locally in Newfie and Nova Scotia! Figure a two week vacation and it's doable.
Better still, what a nice ride to celebrate retirement!