Final answer:
Notice of claim timeframes vary by insurance policy and insurers. The reference to the WARN Act, which requires a 60-day notice for plant closings or large layoffs, does not directly relate to insurance claims.
Step-by-step explanation:
The time frame within which an insured must file a notice of claim depends on the specifics of the insurance policy and can vary by insurer and by type of insurance. However, the information provided regarding employers with more than 100 employees having to provide written notice 60 days before plant closings or large layoffs appears to be referencing the Worker Adjustment and Retraining Notification (WARN) Act rather than an insurance matter.
The WARN Act is designed to protect workers and their families by requiring such notices, but it does not pertain to insurance claims directly. If you are asking about a notice of claim regarding insurance, you would need to consult the terms of the specific insurance policy, as this duration can range widely but is typically within a certain number of days after an incident or diagnosis.