Any given ship has 3 improvement slots each day of the week.
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*Those slots always have a default improvement for a given day, but for ships being [[Improvement/Helper|helper]] of some specific equipment, those slots are reattributed to those equipment.
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*The equipment attribution is independent between remodels, but is often shared for all remodels of a given ship.
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**This means that only up to 21 equipment can be attributed to a given ship remodel (usually much less).
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The default improvement schedule common to all ships with no defined helper equipment (or with Akashi alone) is as follows: