What is the relationship between the simulation time tf in simulink and the actual running time of the system? If my system needs to run 800s before it can be stable, then tf

What is the relationship between the simulation time tf in simulink and the actual running time of the system? If my system needs to run 800s before it can be stable, then tf in simulink must also be 800s, or I just need 800 steps, then the simulation time tf can be 80s, and the sampling time ts can be 0.1s, is that right? I don't understand, because if I set the simulation time tf to 800s, it will take me a very long time to train with reinforcement learning.