I made a large purchase of hay this time. 25 pounds, half Timothy which I have been feeding my piggies and 1/2 bluegrass which alot of people here say their piggies love, so I'll try it. Just wondering how long can hay stay pretty fresh. I previously purchased 9 pounds and that lasted for 2 piggies about 2 -1/2 months. 25 pounds may last me about 7 - 8 months. Can hay stay fresh for this long?