As was said, there is no rule as usage and vehicles vary. Ask an few alignment shops which brands need less alignment. You need to ask more than one shop as opinions there, as here, will vary. Some, in the interest of keeping work coming in may shade the truth. Doing this will also give you professionals' views of alignment frequency need.
If you care to get into the topic more, ask your alignment person to tell you which settings were adjusted each time you get an alignment or if nothing was needed. That may give you insight as to what to do in the future if you do not hit curbs or very deep potholes with the brakes heavily applied.
I do front and rear wheel alignments at home with a home-made trammel bar, a carpenter's level, a couple of jacks, a long straight piece of lumber, a length of string, common tools and a level spot on our garage floor. I have found that modern GM cars hold wheel alignments well. My early 60s GM car had a weak front end. I normally do nothing unless the steering pulls on a flat road which is almost never or tires begin to show odd wear which also is almost never. You can take an occasional look at your tires too and inspect the tread depth with an inexpensive tread depth gauge to be on the lookout for odd tread wear.