I have a huge plunger (12 cups).
A bunch of tablespoons of coffee into the plunger
Fill the plunger with cold water
Throw it into the fridge for 2-3 days
Pour the coffee into a container - coffee for days.
That is like 30 seconds of effort for 3-6 days of coffee.
You may also enjoy it this way (you don't heat it - straight from the fridge. If you have it with milk, then cold milk)