Why was De Zeven Provinciën converted much faster and less radically than the Albany class?
Short answerThey were not equivalent projects: the Dutch retained more of the original cruiser and fitted Terrier aft, while Albany was comprehensively rebuilt around Talos, Tartar, and their supporting sensors.
NotesThe Dutch conversion retained much more of the original ship while fitting Terrier missiles aft, whereas Albany received a far more radical rebuild around Talos, Tartar, radar, and targeting systems. Albany's multiple launchers and fire-control arrangements help explain the enormous new superstructure that distinguishes her profile. The discussion compares De Zeven Provinciën more closely with the earlier Boston-class conversion, which also replaced after armament with Terrier. Because the American project pursued newer weapons and demanded much greater reconstruction, raw completion times do not measure like-for-like work.