Length of cancellation free period

What is the maximum period you can select for the cancellation period. At the moment it seems I can either i) create a non-refundable plan, or ii) create a max 60 days. Given I am now focused on Summer 2023 I'd like to have another option such as 120 - 150 days to gain some early bookings but still allow them to cancel up to 4 -5 months before arrival date. Is this possible?