I moved in with my OH after only a few months, we were spending every day together anyway so it just seemed like a natural progression. I don't think there is a right or wrong, it depends what they feel comfortable with and how comfortable they are with eachother.
I don't think you can set a 'right time' for everyone. As long as they have enough money for moving costs, can support themselves long term, and have a generally good relationship then hopefully things will go well for them
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