Legal analysis: as long as the invoice is reasonable, legal, true and effective, and the company system allows, the invoice reimbursement can span months.

Legal basis: Article 27 of the Measures for the Administration of Invoices in People's Republic of China (PRC). Units and individuals that issue invoices shall establish a registration system for the use of invoices, set up an invoice register, and regularly report the use of invoices to the competent tax authorities.