Ovulation advice..plz help if you can

So I’m just looking for some advice. I don’t really know what to think. I’ve seen some women who only have like a 12 hour surge. One day they have a positive test and the next day the lines gone lighter. But I’ve had mine going on almost two days now. Does any one know if this is normal. I know with my testing I haven’t released the egg yet. How many days does it take? And would I count day past ovulation once my opks test go to high (the line goes lighter)