It takes you what 20-30 mins to get from Riviera to Hollywood Studios? That is just over 1 mile between the two.
I haven't timed it but no, there's no way it takes 20-30 minutes for the ride. If you have to wait to board, like you might have to for a bus, then I supposed you could ultimately end up there. But I'd be surprised to be told that any segment between stations takes more than 5 minutes of actual ride. Epcot to Riviera is the longest - I guess that might.
The whole ride was just over 30 mins from HS to Epcot back in December. RIV to Epcot is not really that long so thats why I was estimating that range accounting for possible delays in the switch over to HS as not sure what its like with the Skyliner being fully open.
I have seen people who Reported went from HS to RIV once boarded and a switch at CBR In about 15 minutes,
So, I think it really does depend on timing, etc. In December, RIV to Epcot was really short I thought and less than 10 minutes once on...maybe it was about 7?