All applicants for nonimmigrant visas are advised to arrive at the Embassy gates at least an hour before their scheduled appointments and to be inside the Embassy at least 15 minutes before their appointments. You need to make sure that all necessary documents are available on the day of the interview to avoid any inconvenience or delay of your appointment. Although all applicants should plan to arrive early, we understand that sometimes unexpected events do occur. A one-hour grace period may be granted to the applicant depending on the circumstances. Applicants are only allowed to reschedule their appointments twice through the call center (not including the initial appointment) without penalty. If the second rescheduled appointment is canceled, an applicant will only be allowed to reschedule after a waiting period of 90 days. Please note that same-day and next-day expedited appointments are not available.
Source: https://ph.usembassy.gov/
