I (we) have a "dark darkroom" so here it is easy. (A room for uprolling films and space with a shelve with many shelves. The room has red light but when it is shut, it is pitch black in there..)
If you don't habe that, maybe some cardboard boxes? Or under a table where you can hang a black fabric to minimize light ?
My experience is, that the first layer will dry in about one hour - the second in about two..
(You can put the second layer on even though the first layer isn't 100% dry - the paper has to look totally matt though...)