how long does it take for black swallowtail to pupate?

[mantisdragon]

I have some parsley in my yard and some black swallowtail butterfly caterpillars are eating it, one of them has made a pupa nearby so I am wondering how long does it take for them to emerge? it just pupated yesterday so does anyone have an estimate of the time?

[admin]

This group of swallowtails are hard to predict. When they pupate after mid-summer, they could emerge in 10 days or they could postpone emergence and overwinter 'til next spring. It's just unpredictable.