When will my caterpillar pupate?

its a noctuid caterpillar and I have it in a jar. Im a bit worried about it because its off its food. I have provided it with the right plant and it has acces to water. it just seems to be slouching around lately and I was just wondering if this is because he will pupate soon. he is about 2 inches long and before... show more its a noctuid caterpillar and I have it in a jar. Im a bit worried about it because its off its food. I have provided it with the right plant and it has acces to water. it just seems to be slouching around lately and I was just wondering if this is because he will pupate soon. he is about 2 inches long and before he stopped eating he was gorging on the leaves I put in his jar. If anybody could just give me some advice on how I could help him and what I could do. also, how long will it take him to turn into a moth?
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