To further investigate the influence of the level of theory and the type of dynamics, the time gap, defined as the time difference between the formation of two C-C σ-bonds, is evaluated for the reaction of methyl-vinyl ketone (MVK) + cyclopentadiene (CPD), R3.ACE MLPs trained at different levels of theory led to slightly different time gaps. For example, PBE0 and ωB97X-D functionals generated average gaps of ≈ 20 fs, while for M06-2X it was ≈ 10 fs (Fig. ). The latter is consistent with the DFT-MD value of 11±6 fs in the literature , indicating the reaction is dynamically concerted, as concluded by Houk and co-workers. Furthermore, as expected, quantum effects on this reaction are minimal, (Fig. ), since the differences between classical MD and RPMD are within 2 fs, while the differences due to the level of theory vary by over 5 fs. Traditionally, such estimates require several hundred quasi-classical trajectories, which are computationally demanding. However, by employing our strategy, we can compute the time gap from 1000 trajectories in fewer than 6 hours.