> What I'm saying is that each "estimated minute" is more likely to have a gaussian distribution
If that were your actual assumption, you should measure the variance of the difference between your estimate and the actual time taken, use that to determine a confidence interval (e.g. 95% of the time, the additional delay is less than x) and then add it to your estimate.
If that were your actual assumption, you should measure the variance of the difference between your estimate and the actual time taken, use that to determine a confidence interval (e.g. 95% of the time, the additional delay is less than x) and then add it to your estimate.