so for the past few weeks i had been under the impression that my elaphus (?) larva would begin to get itself ready to pupate. its recently been very lethargic and sleepy and a little yellow and seems to have made a chamber at the bottom of the substrate(i can peek in from the bottom of the container) so it seemed legit! now it's as lively as it's ever been wiggling around and such? it's a bit nervewracking, as im unsure if it's alright but i guess im just confused. how will i be sure it will pupate and how long does the process take? i recieved him as a l2 ish larva in feb:] seeking sum advice