Red Empress Breeding

Ive got 1 male and 1 female red empress in my 180 gallon malawi tank and have been watching them try to breed for about an hour now. The male has pretty much pushed all of the other fish to the other side of the tank so he can successfully breed with the female but seems to keep getting distracted by some fish that get too close. They have done many circles with eachother however and seem to be breeding non-stop. How long will this last until they stop breeding?
 
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