 Each additional month requires an increasingly higher fee.For example, when an Examiner sends a restriction requirement, a one-month shortened statutory period applies, and if the applicant sends a response on the 31st or 32nd day (depending on the month, as well as on Saturday/Sunday/holiday practice; note that February is granted 30 days), a petition for a one-month extension, and the associated fee, must accompany the response.Most other Office actions have shortened statutory periods of either two or three months.