How long should you be

It depends on how much the couple wnat to make things official... but it`s better not to wait too long if those persons really are in love...

It varies from person to person. You get married when you're ready. Marriage is serious and you don't want to jump into something that you know you're goiong to regret in the long run. So it seems like you're headed in the right direction so far. Just take your time and you two will know when it's time for marriage.