Here is some information to you all.

OPT (Optional Practical Training) can't be implied for students who has used there CPT for more than 11 months in total. Again, this CPT needs to be full-time.

CPT (Curricular Practical Training) can be used for as long as you are in the program. There is no time limit. However, some college provide CPT for 3 or 6 or a year and it needs to be renewed two weeks before it expires, if you still hold the job. No matter what program or field you are in. You need to have job that correalates to your academic.

Please do some research on these topic. Suggestions in regards to topic like these are career changing for people with little or no experience in these fields.

GoodLuck everybody.