What time to do OPK?

Hi everyone. I've decided to give OPK's a go for a few cycles to try and get an idea of when I'm o'ing.
What time is the best time to OPK's? Morning, lunch, arvo, bedtime?
Do I need to do more than one a day or is one enough?

Thanks,

When TTC i always did 2 per day....one around 2pm, another around 8pm. They say the window b/w 2-10pm is your best time to test.

Yeah, I have heard that 2pm is the ideal time too!

I did them twice a day last cycle from the day AF stopped til AF came again. I did them at 2ish and before bed. According to the OPK I didn't O last cycle at all :dunno: not the first time that has happened either.

Cool so it looks around 2pm is the best and then closer to bedtime if the 2pm one is nearly positive. Now I just have to stalk the postman, LOL!!