First time going too fast

Hi!

This is my first time ever doing electroforming. I’m adding copper to graphite paint.

I set the current to 0.6v and it’s 1h30m and it’s almost done. I read somewhere that you needed 4h.

Am I going too fast? Also read that 0.6v to 1.0v is used. As it’s a ring I thought 0.6v is fine.

Thanks!