Toughened glass

I am wondering if panels have a chip in an edge or corner, at what size do they present a risk of breakage? From what I have read,the compression and tension layers increase as glass thickness increases. If a panel shows damage and it did not break, I read the chip did not penetrate the tension zone. Is it therefore unlikely to break? What is the expected damage size measured along the edge and face in say a panel of 6mm compared to 19mm of a chip that is likely to fail?

Thank you.