The current process is: Bosses tells you the programmer and then you instruct the computer precisely. With natural language programming, the boss just tells the computer. There is no you now. Why is this faster? Because you used to take 3 months to get the sofware done, our new system can do it in 3 seconds[the times are arbitary, the general assumption is that it's less than a human].

Of course you are going to still have to specify what you want with both NLP and a human. So this time is constant and it is not relevant when comparing the two system.

What I'm saying is that the NLP would be like a human but faster and less error prone.