Yes, it is true that if you are authorized for more than 11.5 months of full-time (20 hours or more per week) CPT, you will lose your eligibility to apply for OPT. However, because CPT is normally concurrent with the semester, most students are authorized for 3-4 months of CPT (1 semester) at a time. Even when students participate in more than one internship, or complete a full-time internship over the summer, they do not come close to the 12 months maximum.