How can aliens admitted under E.O. 408 (non-visa required nationals admitted for 21 days) extend their stay in the Philippines beyond 21 days?

Aliens admitted under E.O. 408 (non-visa required nationals admitted for 21 days) may extend their stay in the Philippines beyond 21 days by applying for a visa waiver which  will entitle them to an additional valid stay of 38 days. This will allow them to stay in the country for a period of 59 days.

What is the maximum extension of stay that can be granted? 

Foreigners holding temporary visitors visa pursuant to Philippine Immigration Act of 1940 and aliens admitted under E.O. 408 may extend their stay in the Philippines every 2 months for a total stay of 16 months. Extension of stay after16 months, up to 24 months need the approval of the Chief of the Immigration Regulation Division. Extension of stay after 24 months need the approval of the Commissioner. (MCL Memorandum dated 31 July 2007)

If a visa expires on a weekend and /or holiday when will be the deadline to apply for extension of stay and pay the corresponding fees?

Effective 17 September 2007, applications for extension of tourist visas as well as payment thereof, shall be made on or before the expiry dates of the alien's lawful stay, otherwise, payments shall include those for penalties and motion for reconsideration. If the expiry date of the alien's lawful stay falls on a Saturday or Sunday or a legal holiday, the application for extension of tourist visa and the full payment thereof shall be made on or before the last business/working day immediately preceding the expiry date of the alien's lawful stay, otherwise, payments shall also include those for penalties and motion for reconsideration. (MCL Memorandum dated 10 September 2007)