Hello and welcome! I am sorry that you find yourself here. I hope you find it as helpful and supportive as I have. You never have to apologise for any question, length or otherwise. Yours wasn't that long anyway!
Your chemotherapy will probably be about six months long. As @Sister says there's no one size fits all, so we can't be definitive. Some people have some types of chemo once every three weeks or every two weeks. Other types are weekly. Your oncologist is the doctor in charge of this though your breast surgeon should be able to give you a good idea.
My chemo commenced about five weeks after my lumpectomy, though it was somewhat delayed by Christmas. Mostly they like to crack on with it, especially if you're in reasonably good health otherwise.
Let us know how you get on. Hang in there, K xox