I can’r speak for what Mark Mandic does but I can speak for what I do, generally speaking I leave my males with my females for 48 hours whether or not I see a lock, some male may lock right away and for short amount of time which is fine if you witness that and want to remove the male sooner, however I am not one of those people that check all the time to see a lock and take picture (I like to give my animals privacy ;)). Once 48 hours have gone by I will separate them (unless they are locked which obviously I would than leave them longer in), after that that specific pair will meet again a month later. I may do twice a month if one or both the animals are not proven.
I stop pairing when follicles are the size of a quarter or when I feel that we are not making progress (obviously not all females being paired will take)
A lot of it comes with experience and getting to know your animals and the signs they will display and they are not all the same.