Time Limit of each division and year: 3/4/5 hours

I’m planning to practice USACO problems by solving them directly on their website. However, I would like to do it timed. If I’m not mistaken, the time limit is 3-5 hours, with the exact time given just before the contest. Where are the exact time of each contest and each division for every year?

It is usually 4-5 hours long and your start time can be pretty flexible.

“For recent years, 4 hours per contest and 5 hours for the US Open have been the norm.”