Noun
window of time (plural windows of time)
A period of time, often in which a task is to be done
I'll tell you my routine - it's really exciting. I feed, I burp, I change diapers, I pump. And then I have a tiny window of time to myself. Marcia Cross
There is a very difficult period in a comedian's career - it's that window of time where you're good enough to draw tickets but nobody knows you yet. Bill Burr