How much time do I have to report a serious injury to Cal Osha? Immediately but no longer than 8 hours of the known injury/illness. Resource: 8 CCR 342 Reporting Work-Connected Fatalities and Serious Injuries. Suzanne Wallace2021-11-16T22:25:51-08:00 Share This Story, Choose Your Platform! FacebookXRedditLinkedInTumblrPinterestVkEmail