Steve, the plaster would prefer to be kept moist, this will help it set up stronger - a caution though, if you use the garden hose, take care not to directly spray the plaster or let rivulets of water run down one area as it could 'etch' the new finnish. A sprayer on mist is a good option for this (all you want to do is retard the setting a little, which keeping the plaster moist will do, the longer it takes the plaster to cure, the stronger it will end up)
However, I would suggest talking to the builder before doing this so that you don't accidently void the warrantee.
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