Don’t spend 15 minutes complaining about a 30-minute job. Don’t do it before or after the work is done. All you do is increase the amount of time you spend on that single project.
Complaining is never productive and does not correlate to improving a situation. All it does is keep you focused on something that doesn’t deserve your time.
Perhaps this is why the Bible tells people to do everything without grumbling, arguing, or complaining (Philippians 2:14).
Instead of taking your time to complain, take it to be thankful. It will not change the work you need to do, but it will change your attitude about it.