Neat side fact about the Akron Airdock[0]: at some point in the past each 600-ton door on the end needed a drive replacement. My grandfather's company was called in to fix it, but the cost to replace it to spec was too costly. I don't recall the exact specifics but the engineer on the job told me the original opened the door in under 8 minutes. To lower the cost of the replacement they put in a smaller drive but it takes something like 20-30 minutes to open the door. I suppose this video could be used to estimate the total time[1].

[0] https://www.nps.gov/articles/goodyear-airdock.htm [1] https://www.youtube.com/watch?v=9YS1maXSR30