Replacing an engine in a vehicle generally takes between 10 to 12 hours of actual labor time, but the overall process often extends beyond this due to additional steps such as parts sourcing, vehicle preparation, and quality checks. Dealerships or repair shops typically require your vehicle to be at the shop for several days to a week or more, depending on their workload and the complexity of the engine replacement. It is common for the entire process, from diagnosis to completion, to take approximately one to two weeks. This timeframe ensures that the engine is installed correctly, tested thoroughly, and that any necessary adjustments or repairs are completed to ensure vehicle safety and performance.