How many Constellation-class frigates would the fleet need?

If Constellation had worked, how many ships beyond the initial plan would have been needed for current and future commitments?

At least 58 and probably a force in the 60s, supported by continuous production and more freedom to enlarge and modernize later flights.

The proposed requirement is at least 58 frigates and probably a total in the 60s, with continuing production and enough freedom to enlarge or modernise later versions. Clarke's conversation with a naval architect tangentially involved in the Burke programme illustrates the concern about repeatedly fitting new equipment into an established hull and superstructure. That anecdote supports an argument for design flexibility; it is not a formal assessment of an approved successor programme.