i dont think the boys will stop fighting until a clear victor establishes himself. and with the addition of new girls theres something to fight for. i read minimum of 3 weeks for the see but dont touch method and thats what i go by ( this will only be my second year with chickens) but i do have a total of 13 chickens that i had to do 4 different integrations with this method. I've noticed its a lot easier introducing a group rather then a single chicken. males will fight until someone wins.
i also learned after a couple weeks to start giving them " yard time" every day. i usually do this while im doing my chicken chores, i serve as the distraction and toss food and such to distract the other chickens, let them squabble but dont let things get too serious and just monitor then i round them back up.
oh and another good pointer i learned from BYC, if you stop the fight your only postponing it. chickens hold a grudge and that fight will be coming. my first big mistake with integration was trying to stop the fighting, they just kept getting more aggressive until i let them figure it out how they wanted to figure it out lol. had me a little worried but after a decisive victor came forth everything calmed down and those 2 are best buds lol.