Yeah De Facto is proof of at least 6 months living together. We provided rental agreements, joint utilities, joint bank accounts as well as the less solid stuff such as flights from holidays and pictures.
I wish you the best of luck! I have no idea how long you need to be married for. I'd imagine if you're freshly married upon application it may look suspicious (not saying it is, but strangers probably try this to get a visa) and may require further information such as statements from friends and family etc to show the relationship is genuine.
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