"Enter By" date of November 9, 2013

My manager has a Chinese Visa with an "Enter By" date of November 9, 2013. He is approved for a stay of 60 days. If he travels the first week of November 2013 will he be able to return to the US without issue before the end of that same month. I do not want it to expire while he is outside the country visiting Shanghai. Please advise me.