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Ok so meltan ox is once every 3 days. You get around 17 meltans, each providing 7 candy (3 candy baseline plus 3 for a silver berry and one for transferring), meaning it should take about 9-12 days and 2.5 hours of gameplay per Melmetal. You can also passively walk with your Meltan for infinitesimal amounts of candy per week.
Am I missing anything?