What level should you be to play nightmare Diablo 2?

What level should you be to play nightmare Diablo 2? I personally try and hit Nightmare as early as possible, as you level much faster if you are lower when going in. I generally enter Nightmare around level 30 if possible. I definitely wouldn’t wait until 45 or higher as some comments have mentioned. The earlier the better.

I personally try and hit Nightmare as early as possible, as you level much faster if you are lower when going in. I generally enter Nightmare around level 30 if possible. I definitely wouldn’t wait until 45 or higher as some comments have mentioned. The earlier the better.