How long does it take a paper mache mask to dry?

I'm doing a project for school and It's due tomorrow... I'm making my mask out of paper mach� and I wanted to know approximately how long it would take for it to dry, you know before popping the ballon. My mask is based on Ragnaros from WoW, if you have any suggestions please give me tips or other ideas that would be quicker. Appreciate it.