You may think this is a tip about how chilling cookie dough helps it stay together while cooking and makes a thicker, denser cookie. Lots of recipes tell you to do this and claim it's vital.
Fuck that
If you're impatient just use tin foil to line the sheet you're baking on and bake without chilling. It won't really spread much because the bottom cooks faster than if it was on parchment paper and holds it together and you get to have cookies faster. They don't stick because of all the butter fat already in the dough.