How long does CB opk result stay on screen?

[Opktrouble]

I think I have my first static smiley! BUT I did the test over an hour (maybe nearer two) ago and forgot about it

Will the result still be accurate? How long does it stay on screen for?

Static smiley stays for 24 or 48 hours I can't remember which so unlikely to be static I'm afraid. If you pop the test stick out it should show the result on the screen again if it has gone blank now.