Posted by: bange January 19, 2010
CPT vs OPT
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Immigration service (USCIS) approval is not required-CPT is approved in
our ISP office. You can do up to 364 days of CPT without affecting your
eligibility for OPT (Optional Practical Training.) However, if you do
365 days or more of CPT, you will lose your eligibility for OPT.

src:http://www.highline.edu/stuserv/international/thunderworld/optCpt.htm
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