How many times a day do you test for ovulation?

Susie 🇨🇦 • Jesus is my saviour. My husband is my world and we`ve been ttc baby #1 for 5 years. Had Lap 3/24/17 started the IVF process 06/04/18 and did FET 08/24/18 currently have 8 more embryos in the freezer
New to OPK's and am wondering how many times and what time (s) you take them so they are the most accurate?