There is a very small window of time during which a puppy learns what is safe and good in the world. (operationsocialization.com)
Some want exact change, cash only or no cash, separate lunch money for multiple kids, or... MORE payment during a very small window of time. (thespruce.com)
There's an extremely small window of time when your creation is just perfect for your targeted audience, for allowing your product to gain fame. (thebookmarketingnetwork.com)