If you logout in the island you will stay there even after the 24hours and if the other person get divorced.
You can not. It is only possible to enter Meluna for 24 hours after getting married.
" Meluna is a small island located south of Rookgaard, which players have access to for a short time after becoming married. The island is a protection zone and is only accessible within the first 24 hours of marriage. Free Accounts players can also share their honeymoons on Meluna."
Meluna - Tibia Wiki
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