Buses run to the Magic Kingdom for
MNSSHP direct from CBR. I think they are supposed to leave every 20 minutes, but in reality, you will seldom wait longer than 10 minutes for a bus. If you are very unlucky it could run to 30 minutes.
It is probably something like a 15 minute bus journey from there.
To get to Hoop Dee Doo I think the best (and prettiest) route would be to get a bus to the Magic Kingdom and then get the boat across to Fort Wilderness from there. It's a lovely ride on the boat.
I would allow at least 1 hour for this.
Kev