Why was the manufacturing cycle of aircraft carriers so short during World War II?

Building an aircraft carrier during World War II refers to the cycle time. For example, it takes 1 year to build 1 aircraft carrier, and at the same time 12 aircraft carriers can be built in one year, and one can be built in one month on average. Not a short time in absolute sense.

Of course, the technical requirements of aircraft carriers during World War II are far from those of today's advanced aircraft carriers.

It is not impossible to build a large number of aircraft carriers in a short time. As long as there are enough dry docks and enough special steel production capacity, it can be realized, and the mass production of electronic equipment is not difficult (not to mention carrier-based aircraft). However, such an approach is meaningless in peacetime. Because a large number of construction and a large number of services will also mean the risk of overall aging of technology in the future. Therefore, most practices are to improve the technology every time one is built, rather than building multiple aircraft carriers of the same type at the same time.