Depends on the site. Pay sites are worth more than free sites, meaning months/years of income. If the site makes $1000/month and has for 5 years then it's worth more than a site that makes $1000/month for only the past 5 months.
Typically 6 months to a year, more if long term income can be proven. It's almost always worth keeping over selling if the monthly income will stay roughly the same unless of course it make 5 digits and can warrant a lot via sale.
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