This naturally varies from business to business, your industry, terms & conditions and the relationship with your Client(s)…
As a starting point, when a debt is overdue for double the allowed term, the warning lights must go on; eg: 7days to 14, or 30 days to 60…
When the non-payment continues and triples, we recommend that you hand the account over; eg: 21 days or 90 days… This will off course limit your changes at a later stage of having to write off a total amount on one or more accounts.