We have shown that classical molecular dynamics simulations are extremely sensitive to their initial conditions given their chaotic nature due to which two independent MD trajectories diverge exponentially with time. This has been exhibited in several published studies for short simulations (up to a few nanoseconds) including ours. Unprecedentedly, in this study we provide evidence for such divergence between independent simulations extending up to 10 microseconds. Our results conclusively show that MD trajectories lead to very distinct regions of a given phase space even when they are considered "long". Thus, results based on one-off "long" simulations are at least as unreliable as one-off "short" simulations.