The daily bag limit is defined as the maximum number or pounds of fish, shellfish, or seaweed of a given species and size that a person may legally keep in a single day. The related possession limit is the number of daily limits allowed to be kept in the field or in transit. You need to find out what the possession limit is for crab where you are. Alive or dead, it is unlikely it is 3 days worth "in the field" but you'll have to locate the details.