I was once told, no work of art is ever finished.
It just stops at interesting places.
:roll:

Erm, Generally, when all the frequencies are filled, whether it be minimal, or really complex, that`s when The basic track is finished. It`s all then a matter of sequencing and adding edits, until it`s just busy enough, but not too busy.

Sometimes I master myself, sometimes, it goes away to be mastered it depends who it is for.