Synthesizing an implementation from a model in a predictable way is one of the major challenges in real-time system design. In our previous work we addressed this problem by generating in real-time an execution path through a model and by synchronizing the model time with the physical time. The execution path as observed in model time has a time difference with the execution path as observed in physical time. This distance determines the extent to which real-time model properties are preserved in the implementation. The key contribution of this article is an analytical approach for calculating the distance between a model and a corresponding implementation. Based on this distance, the real-time properties of the implementation can be predicted from the model. A paper path of a printer is used as a case study to show the effectiveness of the technique.