The delayed discovery rule is a type of equitable tolling. Under California law, the rule tolls, or postpones, the start of the statute of limitations until you could reasonably have discovered your injuries. The rule applies when either: you did not know of facts that would have caused a reasonable person to suspect that they had suffered harm that was caused by someone’s wrongful conduct, or the exercise of reasonable diligence and a good-faith investigation would not have disclosed that a harmful product or situation contributed to your harm.