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Melissa,
If I remember this correctly from my airbrushing days, I would leave it on for 2 days on cold press illustration board.
I had to go to my reference books and look this up; it seems they recommend not to leave it on the artwork too long (more than 24 hours) because the adhesive may become tackier over time. Apparenly room temperature plays a big part in affecting the tackiness and can make the frisket difficult or impossible to remove.
The type of paper you use will also make a difference. My recommendation is to make a sample on a piece of scratch paper and let it sit over 24 hrs, that should give you a good indication how long you can leave it on. Good luck and please share the results.
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