It looks a bit too small, I guess one piggy would have a bit of space in in but they are really meant to live in pairs or groups.
In my experience a lonely guinea pig is a sad guinea pig, it doesn't matter how much time you spend with it. You can't always be there and you don't really speak guinea pig language.
My sister used to keep Lucky alone. We could see how lonely he was, always hiding away, not really doing much. He seems so much happier now that he has Sammy so I really think you should get more than one guinea pig.