Indeed, many posts provide the information you are seeking in the thread mentioned above.

My most recent experience was just about two weeks ago and the total time from exiting the plane to curbside was about two hours. It is worth noting however that there was very little of a line prior to my arrival. Passengers who came in the 60 minutes after me probably had to wait three hours. Minimum 1 hour, max I was told by UA GS staff is around 5 hours. Depends on arrival time and plane loads.

Another thought... I wouldn’t be surprised if wait times go up this month around the holidays and into the first week of January. Just good to plan for the worst and hope for the best.