Those of you who have 2 pigs. How long does 15 lbs of KMS hay last you? I am going to keep a hay bag filled at all times, and I have 2 litter pans that I will fill with hay for them to either eat or roll around in. My one boar loves to sleep in litter boxes so this will be more comfy I am sure. If I switch the 2 litter trays out at least every other day and fill the hay bag, on average how long will it last? Would love to hear personal experiences. Oh and is 3rd cut timothy hay the best as far as softness and quality? Thanks!