18 Del. C. ยง 3307
Grace period.
There shall be a provision as follows:
โA grace period of .โ.โ. (insert a number not less than โ7โ for weekly premium policies, โ10โ for monthly premium policies and โ31โ for all other policies) days will be granted for the payment of each premium falling due after the first premium, during which grace period the policy shall continue in force.โ
A policy in which the insurer reserves the right to refuse any renewal shall have, at the beginning of the above provision:
โUnless not less than five days prior to the premium due date the company has delivered to the insured or has mailed to his/her last address as shown by the records of the company written notice of its intention not to renew this policy beyond the period for which the premium has been accepted.โ