Just be comfortable
I don't believe that there is any amount of time that they "should" or "shouldn't". I know people who put their child in the crib from the first night and never looked back. At 3 months, Charlie still sleeps in a bassinet by our bed, but he's almost outgrowing it, so soon he'll be in the crib. I say be comfortable with your decision and don't worry about how soon anyone else does it.