Accuracy by rating and time limit

How does the average accuracy percentage vary by rating and by time limit?

Does it always get higher as ratings improve and the time limits get longer, or are there exceptions?

Yes from the 200 or so games I've played I've not noticed any correlation between the different time limits. But I only have only seen a small sample. I'm wondering if anyone has done any analysis on a million plus games?

These numbers (accuracy) mean nothing. Forget about it.

I've looked at a number of grandmaster games. They always have accuracy percentages in the 90s.

Not always... You can find endless amount of GM games with even <80 accuracy.

I'm quite new to chess. I will see if I can find some grandmaster games with lower accuracy percentages.