If it's a warm day you could leave the dough in a draught-free spot on your countertop. Failing that, here are two other suggestions: - Put a bowl of boiling water into your oven along with the dough. Close the oven door. - Run your tumble dryer for a minute or two and then place the covered bowl in the dryer. Of course, these suggestions are only for when you are in a hurry. If you plan on baking the bread after 8 hours, or even the next day you can just leave the bowl of dough in the refrigerator.