It takes serious determination to make it to the point of earning your black belt. Many of us train for years. Dav Patel,the actor known for his role in Slumdog Millionaire, trained in Taekwondo for 8 years. A lot can change in 8 years and it takes perseverance to keep up training. If you are young, schools and life situations can change, for adults, jobs change and if you have kids, well, they change everything. To keep going in martial arts all the way to black belt takes a personality that will push itself.
It takes over three years (maybe less if you are awesome with a side of chips) to obtain a black belt and often longer. I am not writing this to discourage but to encourage. If you commit to keep going, to keep training, you will get to black belt in your taekwondo practice. And I promise you won’t regret it.