A: Honestly, Tammy, there’s a little window of opportunity when you could make some serious money.

B: What’s that?

A: A friend of mine is in urgent need of cash flow to keep his restaurant business afloat, so he is trying to sell an apartment at a much lower price than the market average.

B: But I don’t have the money to buy an apartment.

Note: If you say that there is a window of opportunity for something, you mean that there is an opportunity to do something but that this opportunity will only last for a short time and so it needs to be taken advantage of quickly.