THat's funny because that was the first thing I thought when reading the thread and wanted to add, it would take around 10 minutes. But then I saw the OP was using buses and there is nothing quick about buses, so guessing with the connections this would take at least 1 hour.
I was thinking by bus, maybe the OKW to the Studios and then the Ft. Wilderness bus from the Studios. As for coming home, that gets a little more complicated because the OP needs to see what is open in terms of using a park as a connection. If nothing is open, then the OP needs to bus to DtD and then back to OKW.