How often should i clean my rabbit's hutch?

Hey i was just wondering how often should i clean my rabbit's hutch? The hutch is indoors and is made of wood. Currently, i wipe my bunny's cage with warm water once a week and wash it out thoroughly once a month. He is litter trained and ever night i clean out his hut by throwing away the newspaper on the surface. I throw away all droppings and change his hay. I was just wondering is it possible to clean once in two weeks instead as i am going to be extremely busy this year and don't have a lot of time. But i will still clean out my bunnies cage every night. I will choose a best answer.