How long does the honeymoon period last in a relationship?

Anonymous
How long do 2 people have to be in a relationship till the 'honeymoon phase' of texting/calling everyday, passionate sex, seeing each other a few times a week, and similar things of both people being on their best behaviour comes to an end?

Does it always have to come to an end? Share your tips or experiences on how to prepare for that, or to even prevent it from ending.
How long does the honeymoon period last in a relationship?
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