Most Helpful Guy
No fixed time. It depends on how soon the couple become comfortable with each other, so as to stay together.
I personally wouldn't 'live' with a girlfriend (even if I had one), if I wasn't married or at least engaged to her. Nothing religious, though. Just a preference.
Most Helpful Girl
my boyfriend and i basically start to live together in the second month... And now we lived together for more than two years and love each other so much... but there were many fights and arguments in the first year, which i assume is quite normal for new couples...