I have a Magento CE live site with some 10 modules and 15 third party modules and now I want to migrate to EE edition.
Can anyone tell me how much approx time it will takes and step of how to migrate to EE?
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You can find more details here. http://devdocs.magento.com/guides/m1x/install/installing_upgrade_ce18_upgrade-roadmap.html
-- Updated -- If you do not have lots of modules and files under theme it will take about 8-12 hours for the process.