knifespeaks said:But 'rolling enough times' is different to taking 20. Taking 20 argues that you will get 19 failures for one succes. As we all know, dice don't work like that.
It says that you are assumed to fail many times. In essence, if there is something bad that can happen because of failure then it 'does' happen.
Otherwise, it is just someone taking their time to get it as well as they can.
It can be done with enough rolls, this is true and cannot be denied. Might as well make it easy.