Each of the routes runs every 20 minutes (PO may run more often at some times of the day.)
Each resort has a separate route; you would need to return to DTD to get from one resort to another. The PO boat docks at both FQ & POR.
At DTD, the PO boat docks at the new Marketplace dock, which is on the walking path bridge to SSR Congress Park. The other boats dock at West Side, behind HOB. There is also a separate boat that runs connecting the 3 DTD docks.
The trip from SSR to DTD is very short, perhaps 5 minutes. The other resorts are farther, but I'm not sure of the exact transit times; my guess would be 15-30 minutes.