USCIS will grant the 106(a) extension of stay in one-year increments, unless a final decision is made to... 只要当时没被拒, 就一定申请, 如果已经被拒了, 你当然不能延期了, once H1被批, 就是有效其内有效, 如果延期时候满足条件, 就是合法的H1b延期。