i can be tolerant on time constraints and such because i know the situations that can setback an artist, but there's a threshold that can be crossed from simple delays that go to just plain procrastination.
Keeping in mind that its my "favorite" artist. I would wait for a few moments considering it would be an honor just to be considered for a commission. To be recognized as my favorite artist would set that person pretty high up there in my opinion.
I actually waited a whole year without any updates before finally cancelling. xD She wasn't getting back to me and I had better things to spend my shit on. >_> And she still hasn't contacted me. Other than that I've only waited 6-8 months for a different one, but that one was eventually finished with some threats because I paid $50 for it. -_- Some chick at Otakon put me through the runaround to get my commission.
... and it ended up looking nothing like what I expected. Dx Oh well.