Hello @kwisk
The cutoff value is expressed in days.
I will look into adding this to the documentation 
Topic summary
A developer is seeking clarification on how to specify the cutoff field in Shopify’s SellingPlanRecurringDeliveryPolicy when implementing subscription selling plan options for merchants.
Question: What unit of measurement should be used for the cutoff duration—milliseconds, seconds, days, or cycles?
Answer provided: The cutoff value is expressed in days.
Outcome: The responder acknowledged the documentation gap and indicated they will look into adding this clarification to the official Shopify documentation.
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