How long is Ovulation?

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Okay. So this is a question i probably should have been known the answer too , ttc for 3yrs!

How long does ovulation last?

Exp. If i used my cbfm (Clearblue Fertility Monitor) 7am this morning & got a egg (highest fertility) how long do i have to catch the egg? I Googled & saw 12-24hrs. Is that accurate?