@Rob***
Elite is one example, it's a 5 year visa with 1 year stamps. You used be able to get 6 years by getting a 1 year stamp in the last year of validity but they now only stamp up to the end of the visa.
LTR and O-X would be other examples of 5 year multi-entry visas. In each case you are stamped up to the end of the visa, no later.
Note in some of these cases there may be membership or eligibility for additional visas but there are no Thai visas longer than 5 years, this is a hard cap on visa length. Anything longer than that, it's a new visa. With Elite, this means a full new background check each new visa, if you have a longer membership.
Do you know of a 5 year visa that you can be stamped beyond the end of the visa?