Leave to cool down and set aside for at least couple of hours before serving for the flavours to develop. (coffeeandvanilla.com)
If at all possible, withhold food for at least a couple of hours before hitting the road. (pethelpful.com)
Every week I try to spend at least a couple of hours at the bench, and I rely on my own efforts to push projects forward when they get stuck. (sciencemag.org)