Average time is 90 minutes, as mentioned. The commute itself is about 30 minutes, but there's a lot of variables that can increase the time - how long is the line to check in, how long is the line to your resort (i.e. will you have to wait for the next bus), how long do you have to wait for your bus to start boarding your line, how long do you have to wait on the bus for others to board, how many stops are before yours, and how long will each stop take while the driver unloads luggage. If all of that is working in your favor, it could take only about an hour. If its working against you, it can take 2+ hours which we have experienced.
We used DME in October and while the bus was only half full due to social distancing, there was a bit of added time since the driver has to load and unload everyone's luggage. They've had to do that in the past too, but its significantly more now that there's no more luggage delivery. The line to check into DME took us about 10 minutes to get through, we were first in line for our bus and waited about 20 minutes for it, only waited a few mins for others to board, and then our resort (CBR) happened to be the first stop. So our experience during the current operating procedure was about 75 minutes.