回複：if perm is denied, how long max can I stay in the U.S?

8 teacher, if perm is denied, how long max can I stay in the U.S. legally?

-10 days after your H1 expires.

if I stay in China for one year, when should I start to submit/apply for the second H1B?

-Your employer can file the H1 petition 6 months before your stay outside US reaches 1 year, but you can not enter US until 10 days before the H1 is effective.

when will be the effective date I can start to work if H1b is approved?

-Because it is a new h1 quote, the H1 effective date only can be after Oct. 1 unless there is still an old h1 quote available from the current year or the h1 is not quote-subjected (e.g. work in a university).