Longest Ovulation

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What is the longest amount of time you’ve had high ovulation (per OPK)? Is it possible to ovulate more than 10 days? Can ovulation start, stop, and start again?OPK (Clearblue Digital) shows high ovulation for last 11 days. CM was consistent with ovulation on day 15 after AF ended (OPK still showed high) and now CM is same consistency as it is when I ovulate. I am so confused. Anyone experience this?