There's not enough information here for us to give you an accurate estimated time. Are you DEP? Have you already graduated? When did you go to MEPS? I don't think the MOS you'll be training for effects training seats in BCT, but I could be wrong.
I know when I was in the DEP I waited about 8 months, but I had to graduate too. I left for basic training about a month after I graduated HS.
Hope I helped a little bit, just try to elaborate more, nobody is going to know anything unless you give them enough information to work off of
Either way, good luck and stay motivated.