H１B 延期是否要用加快（Primium Processing,PP）?

H１B 延期是否要用加快
因為前段時間在下剛把H１B 延了，有一鱗半爪的經驗，向需要的網友介紹。
可考慮PP的情況：
１。近期要出美國又沒有AP
２。要RENEW DRIVER LICENSE
３。家人需H４（簽證或延期）
４。＄１０００是公司出，或家裏有很多＄＄＄＄＄
不用PP是否可以：
１。足夠的早時間（４－６個月）辦延期
２。足夠的時間遞H１B的申請：
笨人的是一個月，JULY ２８（周５遞），AUG ３支票
CASHED，得到CASE NUMBER。
法律依據（from CIS web）：
Chapter 8, Section 274a.12(b）(20) of the U.S. Code of Federal Regulations
全文：
(20) A nonimmigrant alien within the class of aliens described in paragraphs (b)(2), (b)(5), (b)(8), (b)(9), (b)(10), (b)(11), (b)(12), (b)(13), (b)(14), (b)(16), and (b)(19) of this section whose status has expired but who has filed a timely application for an extension of such stay pursuant to Secs. 214.2 or 214.6 of this chapter. These aliens are authorized to continue employment with the same employer for a period not to exceed 240 days beginning on the date of the expiration of the authorized period of stay. Such authorization shall be subject to any conditions and limitations noted on the initial authorization. However, if the district director or service center director adjudicates the application prior to the expiration of this 240 day period and denies the application for extension of stay, the employment aut horization under this paragraph shall automatically terminate upon notification of the denial decision. (Revised 1/1/94; 58 FR 69217)
連接：
http://www.uscis.gov/propub/ProPubVAP.jsp?dockey=37af6486eb2edd33f062f159759ed51b
解釋：
隻要遞上H１B的延期申請，在沒有得到批準的情況，該工人仍然可以合法工作２４０天