Suppose we had been able to add a third group to the planned study so that we could test the 3-day, 4-day, and 5-day working weeks. We would like to study the differences in mean nightly sleeping time across these groups using a one-way ANOVA model. The experiment would have 100 employees in each group while planning for a power of 0.8 using a significance level of 0.05. Under these circumstances, what is the minimal effect size that could be detected? Convert the calculated effect size into minutes under an assumption that the standard deviation is 1 hour. Produce a numeric answer that is rounded to 2 decimal places.