I'd leave it at least overnight if I were you, but if it's only a thin layer and it can be kept in a warm, dry place, then a few hours. Possibly less, I'm not 100% certain.
I found this, though.
I've made a few pinatas for my children and a few mache fish, It always took about 24 hours to dry. That was for smaller pieces. maybe by letting it dry mostly leaving it a little damp between layers, enough to bond, but to control molding, again more important for larger pieces. You can insure a positive outcome. Another person said 4-28 hours.Paper Mache' takes about a day to dry, but if you want to speed up the process, you can use a blow dryer, that doesn't take that long.
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Well, It really depends on how many layers you do or how much glue you use. So if you didn't have many layers then i would say 1-3 hours which isn't that long. But if you use a lot of layers and glue it would probably take over night which is 8-14 hours. Oh and its best not to let it dry in humid air i prefer to put it in front of a fan or let it set in the sun.
It depends on how thick the layers are. Usually if you coat a medium balloon with 2 layers it will dry overnight (8 hours), but if it is extra wet or more layers, it can take a whole day. Try to remove any excess liquid from each strip of paper as you are making it, and it will dry a little faster. You could also use a hair dryer to speed it up a little bit.