Endurance separates a modern corvette from a frigate

If modern frigates and destroyers perform cruiser-like duties, what distinguishes the smaller surface-combatant types below them?

A corvette is generally optimized for shorter operations, while a frigate is the smallest combatant expected to sustain the cruising role for weeks through greater endurance, stores, and crew accommodation.

Historical labels overlap, and the claim that corvettes are civilian-built while frigates are military-built does not work consistently across periods. The discussion connects Second World War corvettes with civilian whalecatcher designs, then notes that modern Visby and Skjold ships follow different construction practices. Operational endurance offers a more useful modern distinction: frigates are intended to cruise for weeks, while corvettes generally accept shorter deployments. Skjold is described as a fast missile craft near the lower end of the corvette range, with its original design distinguished from its completed fit. Visby provides another small but purpose-built military example. Longer deployments also require the stores and accommodation discussed in the later follow-up.