It varies. Sometimes you will have a bus waiting as you approach the bus stop. Other times you’ll wait 10, 20, 30, 40, etc minutes. It’s completely unpredictable.
I am staying at BLT now and seeing upwards of 20 minutes between buses. Waited over an hour at 430 this afternoon to leave DHS. Missed my ADR but they honored it. Both the monorail and skyliner were down because of the storm and Disney did not bring in enough additional buses. Leaving DS now with a full bus.