If it were realistic, I would push the end time back to 15:00.
If you are writing from a (purely) development side, then that potentially leaves you with other teams in the mix (say a database management and operations teams). You may not have any access at all to any live machines, and you are reliant on these other departments to deploy your changes. That means you are reliant on them to help fix errors and roll back.
Also, as you mention DNS, it sounds like web development, and if you are UK based, then one of your peak traffic periods may be 16:00.
And this all ignores the times when you are implementing major changes (that might include hardware changes as well as software) where downtime is unavoidable (or highly likely). Then you must consider the user/customer base first and pick off-peak times in order not to cause long lasting damage to the business.
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