It depends on the company. Most, if not all, engineering internships are full time (40 or more hours per week).
This usually means 8 hours per day Monday through Friday, or [4 10's] if the company allows this. [4 10's] is when an employee works 10 hours per day from Monday through Thursday, and can take Friday off (3 day weekend).
As for the hours, the work time varies. My internship is from 7-330. Some are 9-530. Most places don't pay you for lunch hours.
So expect 40 hours per week for an engineering internship. Anything less than that shouldn't be called an internship, and should be labeled as "part time job" or "research".
I'll let you make the judgment based on this information whether or not you can take the LSAT class or not.
