What long periods at sea do to a warship

How do very long periods at sea affect a 20th-century warship's fighting ability?

Marine growth, machinery wear, and corrosion erode performance and readiness, while salt exposure also constrains what aircraft can operate safely at sea.

Long deployments accumulate marine growth on the hull, wear in turbines or reciprocating machinery, and corrosion throughout exposed fittings. Salt is present not only in direct spray but in the humid air and haze surrounding a ship, so it penetrates spaces that appear sheltered. Naval aircraft therefore need engines and airframes designed for low-level salt exposure, carrier spray, and firefighting water. A land aircraft placed aboard without that protection may require extensive rebuilding after routine contact with the maritime environment. Endurance at sea is consequently a maintenance and materials problem as much as a fuel or crew problem.