Join Date: May 2006
Location: Beautiful British Columbia
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Everything I've read has said 24-48 hours after your last positive. However, OPK's don't confirm ovulation. They predict when it *might* happen based on the surge of LH. The only way to confirm ovulation is with a temperature shift.
Having said that, I got positive OPK's on cycle days 18 and 19, and then Fertility Friend confirmed ovulation on day 20 based on my temps. So that's a day ("24 hours") after my last positive.
I test multiple times a day, and as soon as it looks like it's getting positive (I get anywhere from 1-3 days of almost-positives) I get on it. This cycle I had 4 days of perfectly timed intercourse before my confirmed temp shift thanks to the OPK's.
So to answer your question... who knows. But as soon as the OPK is getting close to being positive, start timing your sex and keep going until it goes negative again. And if you can, confirm it with temping.
Frankenstein never scared me. Marsupials do. Because they're FAST.