When do tomato worms change into moths?

We found a tomato worm in our garden and we wanted to do an educational experiment with our son. If we keep the worm in a jar, when will it change? or will it change because it's inside? How much do they eat? What else will they eat beside tomato leaves?

Answers:
Those big fat green worms? I don't think they change into moths, especially if its in a jar.

Other answers:
they don't
they don't
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