The amount of rope is fine, if you can choose a better material than nylon (it stretches and has more elasticity*), such as polyester or polypropylene would be better.
* If your anchor point isn't very high, that will be a problem, because when you apply your weight, that type of rope material (nylon) will stretch more and you'll end up lower than you planned.
If it's a
single braided rope, it will be easier to tie the knots with it.