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What is the optimal length that a couple should date before moving in?
(lemmy.perthchat.org)
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You're not going to get a useful number for this. There's simply too much variability between cultures, communities, and individuals for ant number to make sense. This relies in factors including emotional maturity, work loads, financial situations, friends/family/pets/children, leases, etc...
"Waiting until marriage" is usually under the assumption you will combine finances and have kids and take on debt (house ig) immediately while learning how to live with eachother. So several peak stressors at once. Maybe your citations are hoping the couple gets trauma bonded?
Also I've personally never known anyone who married before spending multiple years cohabitating.