112,000 miles and I just did a drain and fill yesterday, will be replacing the pan and another drain and fill next weekend. I haven't had it a few months and it had never been done. There was a huge difference for me in shifts from just replacing the initial 4.5 qts.Ordered some trans fluid and a filter. Planning on doing a trans fluid change later this week.
TBH, not sure if it's ever been done. I'm positive it's never been done in the 5 years that I've owned it, so I guess it's a bit overdue.