f887361f_ing_Configuring___Eclipsepedia__Cache_Annotation_Attributes_Description
[Attribute] expiryTimeOfDay [Default] no expiry [Required?] Optional [Description] 
Specific time of day (org.eclipse.persistence.annotations.TimeOfDay) when the cached instance will expire. Queries executed against the cache after this will be forced back to the database for a refreshed copy.
EclipseLink/UserGuide/JPA/Basic JPA Development/Caching/Configuring - Eclipsepedia