Question

On average, how long does it take to make one plastic water bottle?

Answer 1

since time is money, and mass production is mass production,
I'd say the actual fabrication of a bottle would take a fraction of a second.
That's not to say that the processing of the chemicals for the plastic wouldn't take longer.

Answer 2

About 2 seconds because like he said ^ time is money and that means making as much as possible to make maximum profits