Need help with breeding tank?!?!?!?!?!?!?!?!?!?!?

i have a 10gallon tank, and i am trying to breed platies, so far i have a small castle ornament, an umbrela, and bout4 or 5 fake plants,(im going to float more for fry) i have 1male and 4females and a pleco fry bout .5inches. in my orange sunburst mickey mouse platy you can see the little eyes inside her belly, but shes the only one that has that the rest of platies are red, i can see the babies moving slightly so how long willl it take to give birth.