My cages are 19" x 30" with an upper ramp of about 19" x 6" (not even 6 sq. ft. since you can´t count the top ramp in the calculation). Each cage houses one pig. They have a run area of about 10´ x 10´ where I let them run between 20 mins and up to 2 hours a day, depending on how much time I have.
With this much floor time, are these cages still too small?
One more thing: After about 20 minutes of floor time, my two pigs seem to get bored and find a dark corner to sit, lounge or sleep. It´s frustrating since I want them to get their excersise during this time. So what´s the point of longer floor time, if they don´t use it for excersise?
I used to have my pigs in smaller cages and let them out for a couple of hours a day, like you describe. Just like yours they would have an initial burst of activity, then sit and snooze in a puddle of pee inside a tunnel, paper bag or box for the rest of the time. However, after I built them a large cage, I found out that they take their exercise in bursts of activity throughout the day, interspersed with lengthy siestas! What a life, eh?
If you have absolutely no option but the smaller cages, it might be a good idea to give them a several shorter exercise periods rather than a long one of several hours.
I used to bring my old pigs out for floortime and let them run around in a secure and enclosed area for an hour daily. Throw in some toys and cardboard tubes and it´s like a little playground. I didn´t really give it much thought which ´hour´ is most appropriate. As long as they were awake, I´ll grab them and chuck them on the floor. Oh, it will help to pass around some veggy treats during floor time too.