I used to aim for 85k, but with the success of my Spacemage trilogy, which each came in around 65k, I've made that the new target.
My Jon Hunter books tend to go longer, but the last one only made 72k. The fans don't seem to mind.
Talking of fans, the comment which seems to come back more often is hurry up with the next book. It's a lot easier to get a 65k book out in 2 months than an 85k book, at least with my current health issues.
I notice in LitRPG circles new authors are writing 200k+ epic doorstops, which take them all year or longer, and they don't have any point in them where they can be divided up into a trilogy.
Personally, I'd rather read a rapid release trilogy, than wait a year for an epic doorstop.
Anyway, my fans seem happy with whatever I come out with, and each book is as long as it is. But my target has shortened over the last year. If they run long, fine, but I no longer worry if I hit the 60k mark and it ends.