They will have about a 4 inch wingspan or around there when they hatch out. To give you an idea of how big they are going to be, here is a picture of my adult panther chameleon eating one....
https://www.chameleonforums.com/media/nom-nom-nom.42856/
As for how to store them.... I keep mine in a container on a piece of wet paper towel because if they are not kept moist, it can make the wings become a little deformed when it hatches (not that it matters a WHOLE LOT if you are only using them to feed off).
Typically they will hatch in about a month or so... assuming they don't go into diapause. Then they can take forever. I had some hornworms back in March and some of them cocooned, then hatched within a month. All except for one. I STILL HAVE THAT ONE from that batch back in March and it
still hasn't hatched because SOMEHOW, it went into diapause. I don't know why, because it was kept under the same bulb as all the other ones for 14 hours a day to make them hatch faster, yet this one didn't come out. The rest of them all popped out within a month and this other one I have just keeps on sleeping. It still wiggles itself though every time I touch it so I know the thing is still alive...... The wait continues.....
