You should have no problem with FB paper, they take a long time to dry so as long as they are in a tupperware box and straight out the wash they should be fine for 2 hours +. Make sure they are all the same way up ( emulsion : print side up ).

Do not do this with RC prints, especially GLOSS as the water does not penetrate the surface and they can stick together very quickly, especially emulsion side to emulsion side, you can normally get away with it by re-wetting, but its possible you could cause damage.

Simon ILFORD photo / HARMAN technology Limited :