At least 10 of those years will be for training. There will be no 'operations' other than training. Carrier air operations will usually be against the wind, so the entire fleet will have to learn how to read the local weather and maneuver to conduct efficient air operations.
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These operations consume fuel and training scheduling will have to take into consideration the unpredictability of combat operations that will consume fuel beyond what was estimated. Then the air wing stand down and the fleet return to port to study what was learned. In all this time, personnel changes occurs and the new ones will have to be trained. Accidents, minor and major,
WILL occur and lives will be lost. For each, the fleet will cease operations in order to find out what happened and how to recognize the clues that leads to the mishap and how to deal with it.
Escorts will have to learn how to maneuver with the carrier and how to protect it. Complex exercises must be devised and exercised in order to remove ineffective captains and install good ones. Escort captains must realize they are expendable first before the carrier.
Do not for a moment think this fleet is ready for combat. Right now, a pair of enemy destroyer/cruiser can throw the entire fleet into disorder.