"Peak hours" refers to specific times of the day when there is the highest amount of activity or demand for something, such as transportation, business, or customer service. Full definition
Then there is the time spent going to the location and waiting for a table, which can be long during peak hours at a good restaurant. (lawyerist.com)
At peak hours of sunshine, when the users can not take advantage of all the power their systems produce, they feed it back into the infrastructure. (scientificamerican.com)
Protect yourself from the sun by wearing hats and sunglasses, avoiding the sun during peak hours of the day. (annmariegianni.com)