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That isn't the most simple question to answer, as it depends on a number of variables, including size of the company and what components of an ERP system will be implemented, and how effective the training of employees is. I would count on sometime between one and three years for full implementation from a traditional ERP vendor. I have limited knowledge about the newer SaaS ERP applications, but I understand that they take far less time to implement. Even with a SaaS ERP vendor, you still need to take into consideration the time it takes to train employees to effectively utilize ERP.