You stated on one trip, that the trip cost more than the Uber estimate. This could be because they added a toll to your bill (Benoa Bay toll bridge), or you had horrid traffic.

For long waits, I have had a Uber ride where we had a visit to the doctor, followed by a lunch. The distance was 10km maximum, and waiting time was 2 hours. We were charged for a 60-70km trip. Always pays to check your receipts.