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guineapiggiepie a 2x5 is tight, but it's going to depend on how your girls get along. If your pigs all behave well together then they will likely be ok. Is there any way you could make your cage more of an L-shape to give them more space?
There cage obviously fills up faster will poop, but as I spot clean at least once a day and am happy with how clean it stays.
How much hay and veggies I use is hard to say, I have this cage of 4 but I also have 4 more girls (a pair and 2 singles), so I go through a lot of food with them. I guess if half the supplies I use, I would got through roughly 50lbs of hay in 4 months with 4 pigs. About half a head of red or green leaf lettuce, a small-medium pepper and then whatever other veggies you feed. I add in cucumber, radicchio, tomatoes and carrots.