We did two very successful rope drops for FoP last month, and one fail. The two successful times we got to the parking lot one hour before opening (8am for 9am opening) and even though we weren't at the front of the pack, both times we walked without stopping all the way through the line and onto the ride - about 20 minutes from tapstile to ride.
The fail resulted from us arriving at 8:30, which meant that by the time we got to the bridge in Pandora, the cast member with the "end of line" sign was saying it was a 60 minute wait from that point. We didn't get in the line since we had achieved it twice before - we walked to the Africa rope drop instead and did a walk on for the safari, which turned out to be the best safari ever, with lots of animals out and very active.