If the contract or work agreement, etc. specifies when paymenet is due, that is enforceable; and to have it paid earlier than that, the customer (the property manager) would have to voluntarily agree to do so, and could ask for a discount or other consideration for doing so.If there was no indication of when invoices would be paid, then 30 days is still probably the reasonable time frame--most invoices for contractors are payable within 30 days, and it is very rare to pay a contractor weekly (unless specified so in the contract). Therefore, the property manager could most likely refuse to pay earlier than 30 days, unless you offer it something (a discount) to make it worthwhile--in the absence of specific terms, courts would look to common norms or standards to decide what is reasonable, which is probably payment "net 30."