We use an Omlet Cube, so it's different from a typical coop (very shallow droppings tray), but I plan on treating a traditional coop the same way - manually removing the bulk from under the roost bar at least every other day, then a full shavings changeover as needed.
How many chickens do you have?
I like to scoop out the bulk of their droppings daily, then change over the litter whenever it's getting spent. Hemp lasts a lot longer than pine shavings (in my experience), but the price is ridiculous in comparison.