I have a smiley face how long do I have??!

Amber • Married 3 years, 2yr old daughter, ready to conceive baby #2

I haven’t been keeping up with ovulation. Purchased this clear blue test and took it just now and it’s a blinking smiley face!! I’m sure that’s good how long do I have to take advantage of this ovulation? My husband has left for work and I’m about to head out now 😩😩