Once you’ve formed your dough ball, if you’ve chosen the “gluten-free” option, I recommend rolling it out right away.
This is because the lack of gluten will make your dough very brittle, especially if it loses moisture while resting.
If you’re using wheat flour, you can let it rest for about half an hour. If you’re baking the tart the next day, it’s best to let it rest in the fridge overnight and take it out an hour beforehand. It will be easier to work with.