Be neither obsessive nor a procrastinator, so to speak. Rather, be timely. Do it ATAP. So soon or late also has factors of probability of being wrong from tolerances and exceptions to mean, thus the precise algorithm must consider all potential variances and the probabilities to yield an optimal schedule. Monte Carlo simuations often test these for results in complex systems, otherwise worst case values are used for conservative results.
But the reality is many variables are synchronous to environment such as voltage or temperature, so worst case if not factored by these variables can be low probability.