Yup. Mine listen to the sit, stay, down, and come here off leash. My male can heel off leash too. It doesn't look as great as I want it to but he does it and we'd pass the BH anytime. Not with flying colors but we'd pass.
How long did it take me. Well, with his background it took me much longer than it would have taken usually. It all depends on your background and how experienced you are. There are dog handlers out there than can train a dog in less than half a year and pass the BH with flying colors and others take over a year.
Indra, my little one is 7 months old now (almost 8) and when we are on off-leash walks she will listen to hier, sitz, platz and bleib just as the others do.
I honestly don't do much. I don't go to they clubs anymore because somehow I get farther without going to the club. Everything I want to see in my dogs I can pretty much teach them myself and if I have a problem I get on here and ask for advise.
However, I know where my boundaries are and while my dogs are well behaved they could do much much better if I had the right trainer.
Anyhow, I do a lot of clicker training. Table Training, I always request commands on hikes, they have to show me a sitz or platz and give me attention before they get their food.
But I know how to train them the basics, I grew up with parents that handle dogs for 50 years now and I don't necessarily need a Club to teach them basic obedience and pass the BH.