OPK testing Question???-For" long cyclers"

Dew
What all times of a day and how many times a day do you use opk? And which day of your cycle do you start testing?( despite what glow says as your fertile window)
 Do you dip the stick or use urine stream? Is any method better than the other?  
Is it in sync with your bbt always? 
 I have an average of 40 days cycle..  PLEASE HELP!!

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