There are a few things to think about:  How many chickens do you have?  Do they free range at all or are they always in the coop/run area?  How big is your space? 
My girls' coop is only 4 x 8 and their roost is 4 x 4 but they free range from sun up to sun down, coming in only if they want to.  I use the deep litter method, so need to clean and sanitize 2 times a year on the coop floor.  I have a metal pan that is an oil drip pan from the garage that fits perfectly under my roost.  I clean it 1-2 times a week.  In the hot summer, more often.  I find that keeping my coop clean isn't as much work as I thought it might be.  And, it's fun to chat with the girls while I do.