Sentence examples for that does it from inspiring English sources

"that does it" is a correct and usable phrase in written English.
It is often used to express that something has reached its limit or has completed a task or action. For example: - "I've been studying for hours, but that does it, I can't focus anymore." - "I gave them every opportunity to make things right, but that does it, I'm no longer working with them." - "We've tried every method to fix the problem, but that does it, we'll have to call a professional."