I just had mine bonded over a week ago ( and it took a few mths in different cages ). they had a really hard time accepting one another ....
I had the cage(s) close to one another, at where they would pick up the scent of each other ....
than I separated the cages for a week and than reintroduced them again, a week later.
now they play and court one another ( as in laying next to each other and play w/ each other ). but when its time to call it a night they are still in separate cages for now ....
I would recommend something similar ( or some one may have better advice ) ..... best of luck