The pre-licensing course certificate lasts for 1 year from the date it is issued, and the student certificate of completion lasts for two years.
There is something else about Enhanced or REAL ID,  if I had a REAL ID, but it has been misplaced, can I replace it by mail?
Yes, indeed, you can.  If you already have an Enhanced or REAL ID you can replace by mail and your document type will stay the same.
What is the charge associated with replacing a REAL ID by mail?