The longer it cools, the better it will be and it's best to store in the fridge for at least a few hours before serving. (tuulia.co)
In traditional terms that usually means at least a few hours of configuration and tuning. (slashgear.com)
If your goal is important, always start early enough that you can let what you write sit for at least a few hours before you give it a final edit. (inc.com)