What is Benefit Period?

Legal Definition
A benefit period is a length of time during which a benefit is paid. This may be a government benefit such as the British Housing Benefit, or a healthcare benefit system such as the American Medicare, or payment from an insurance policy such as a Payment protection insurance which covers mortgage or other commitments after accident, illness or redundancy. It may also be known as the Payment period.

A related terms is Benefit week used in calculation of entitlement to benefits.
-- Wikipedia
Legal Definition
The period money or benefits are paid to the insured or their dependents.