Business Central make-to-stock and make-to-order implementation projects are made up of three phases. Implementation, Go-Live, and Transition. Implementation varies depending on the tier of your project. Bronze tends to be 5 months, Silver is 7 months and Gold is 9 months in length. Go-Live is one month. Transition is two months.
The average Silver project is 7 months of implementation, followed by a go-live with 1 month of intense support and then 2 months of transition for a total of 10.
Customers who want to add more resources to a project and dedicate more hours can shorten that time significantly. There is a limit on how fast any ERP project can go - usually based on decision making, testing, and training hours available to your team.