if you just have the poop then its no time at all, as my buns just go to the loo downstairs on the newspaper i just shake off the poop and recycle the paper (ifs its not to dirty) hay takes a while to rot down, you could try the double dig technique if you have nothing growing in the space you wish to put the stuff in, ive found newspaper takes a while so 6 to 12 months, its not to bad if you turn over the soil every now and then to break in up