Bare minimum 15-20 minutes and that's if everything is magical... you park so close it's quicker to walk to TTC than take the tram, a monorail is in the station and doesn't hold along the rail.
All else being equal, I think monorail is faster than the boat. But if anything wobbles the boat is where I'd prefer to be. Once the boat gets there and loads, it goes. There's room to move around. I have been stranded on the monorail beam for 20-30 minutes. Crying kids, angry people growing late for ADRs, stuffy, getting hotter in the Florida afternoon. Very bad.
I would allow 45 minutes from parking to arrival.