We don't have to look at fancy modern experiments - merchant ships going between the Americas and Europe could easily take 3 months per journey, usually with ex

We don't have to look at fancy modern experiments - merchant ships going between the Americas and Europe could easily take 3 months per journey, usually with extremely cramped living conditions. The Spanish Empire's regular "Manila Galleons" between Manila and Acapulco could even take half a year each way! For more modern analogies, naval ships will regularly spend on the order of 100 days at a time between port calls; the USN claims an average of 77 continuous days at sea for its ballistic missile submarines. This article is trying to extrapolate from modern civilian airline travel experience - short, very high passenger density (almost as tight as a bus!) - to a passenger sealiner experience with literally an order of magnitude more space. (Starship plans are for 100 passengers for interplanetary, 1000 passengers for point-to-point on Earth.) Think living in a cramped dorm, not riding on a cramped bus.