We should also not blithely assume that the PLAN combat availability will follow the same trend as western navies because of the vast and fundamentally different ways the PLAN treats and uses its warships compared to the west.
The western navies generally have this ‘policemen of the seas’ mentality and unspoken mission statement. Whereby their ships are pretty much out on development(patrol) whenever they are available.
You need a 3 times multiplier to be able to know how many ships are on the ‘ready for, or already deployed’ roster at any one time when you are on such a perpetual deployment cycle.
The PLAN does not burden itself with such continuous and open-end commitments.
While the western media and analysists tend to sneer to the sight of the bulk of the PLAN fleet tied up at port, the other side of the coin is that all those warships are pretty much ready for immediate deployment within 24-48h max.
Because the PLAN typically only send their warships out on short training missions (excluding it’s Aidan anti piracy missions and irregular one-off goodwill tours), those ships need correspondingly less repair and refit time once they return to port.
Similarly, their crews won’t be released on long rotational breaks since there isn’t the same hardship of long term deployment that they need to be ‘compensated’ for, that elemates the recall period, and also should vastly reduce re-training needs, since those crews would have been on near constant training while their ships were tied at port, and would not need to be brought back up to speed as those who have just returned from months off would.