Impact of CPT on Optional Practical Training
Under current US federal government practice, CPT approval has an impact on your OPT ONLY in the rare case that you do one full-year (12 months or more) of FULL-TIME CPT. IF this happens, you will lose your eligibility for OPT. Part-time CPT or full-time CPT under 12 months should not have an effect on your OPT eligibility.