Guinea Pig Introduction Tips?

Question to you, why do you want to disturb the harmony you have with the two you already have by tiring to add two more when you know they will most likely fight. If you do keep them in a second cage it would be OK i guess i am jsut wondering if you are aware of how much it will take of your time to care for them. I mean even through they have a buddy in all fairness they need at least an hour a day of your time and you spread that over 4 it is kinda hard to think you can fairly give each one the fair amount of time they deserve to have.When we decide to cage an animal we make the decision to provide for them every thing they need emotionally and physically, can you give 4 guinea pigs that?