Implementation time depends on business size, number of modules, customization, the scope of process changes, and the readiness of the customer to take ownership for the project. Modular ERP systems can be implemented in stages. The typical project for a large enterprise takes about 14 months and requires around 150 consultants. Small projects can require months; multinational and other large implementations can take years. Customization can substantially increase implementation times.
Besides that, information processing influences various business functions e.g. some large corporations use a just in time inventory system. This reduces inventory storage and increases delivery efficiency, and requires up-to-date data.