In between eight and twelve centimeter
In Spring, mostly April. Or earlier in captivity, the moths emerge soon after the pupae are taken out of the fridge.
Most Ligustrum species. Syringa and Fraxinus are accepted alternatives.
Very easy and fast growing at room temperature. Caterpillars pupate within a month after hatching. Keep the first three instars in well ventilated plastic containers but move to a netted cage after they've molted to the fourth instar. Pupae are best stored in the fridge. They have a (partial) second flight in autumn when the pupae are kept warm.