I am making a boob cake, but I need to incorporate a miller lite can with it somehow. It can't be made out of cake and it needs to be lightweight and fast drying. I thought about melting chocolate, but it's too hot in tn. Would a gumpaste shell dry in time? I have 22 hours.

How about an....empty miller lite can!?

I haven't worked w/gumpaste, but understand that it does dry rather quickly. You could wrap it around a can for the mold then slip it out.

I don't know how small it has to be but if it can be big, you could stack 3 or 4 4-inch cakes on top of each other and just decorate them with buttercream to look like a beer can.

yep, 22 hours plenty of time

can dry it in the oven door closed, light on
faster yet...under fan or electric space heater

or
on top of oven while baking the cakes (the top does get warm!)

just be sure air gets to both sides

dry on form until stiff enough to hold shape
then remove form and let dry completely