网站查询到I-797已经approved了，多久收到信函

我新的H1B amendment I-797已经在10.15批准了。请看下面网站查询结果。我想问问通常多久位于美国加州的律师收到该批准函？谢谢。我重新约了11.8的面签，不知道能否来得及。
Decision
On October 15, 2010, this I129 PETITION FOR A NONIMMIGRANT WORKER was approved and we sent you an e-mail notice. Please follow any instructions on the notice. If you move before you receive the notice, call customer service at 1-800-375-5283.