snapshots and step size must be assessed simultaneously since the quantities depend on each other. Basing our initial guess for the step size on the hydrogen-bond switching dynamics in liquid water, which has a hydrogen bond lifetime of about 0.78 ps,, led us to investigate step sizes of 1.0, 2.0, 3.0, 4.0, and 5.0 ps for different numbers of snapshots. We found that these step sizes had a minor impact on the results for a given number of snapshots, leading to the average window error mainly depending on the number of snapshots. Therefore, we only present the results for the 2.0 ps step size, while the rest of the data can be found in Tables S1-S4 in the Supporting Information.