I have already advised him, so you are wrong. My wife has a 10 year tourist visa for the same reason, that it is a pain to apply each trip as we sometimes travel 2-3 times a year on the spare of the moment.
You can avoid the paperwork by applying for a 10 year tourist visa to avoid keep applying every trip, if the embassy is issuing visas at this time. You can travel in and out as many times as you like but each trip, she can only stay 6 months.