You would have to "define" long term heavy use.
For many people, a "lifetime" is 2,000, 5,000, or 10,000 rounds. Others, it's 20,000 rounds a year for "so" many years... until you have to replace most of the parts, multiple times.
So, it's a good question because I haven't "read" about any high-mileage RIA's and how they hold up. Time will tell.
I have "read" that "quality" 1911s that should go between 100,000-200,000 rounds with the major parts "intact"...slide/frame/barrel. Of course, what loads you shoot and how you take care of it will alter your "mileage". Barrels in particular.