How long would it take to achieve black belt level skills in Hapkido?

Not showing off but I just wanna give a little context. I am 23 years old and I'm a 1st Dan in WTF Taekwondo, Kodokan Judo, Japanese Jujutsu. I’m also a BJJ purple belt, 3rd Dan in Goju Ryu Karate, I also did Wing Chun and North Shaolin for a couple of years (on and off)