How many days should be counted in a week?

6-days week makes 60,833(3) weeks in a year which is closer to integer (61) than 8-days week's result 45,625 (almost in the middle between 45 and 46). Moreover, 6-days week has much stronger advantage: if we'd leave Saturdays and Sundays and we'd cancel Mondays - the most painful week's days, we'd get four days to work and two to rest. Isn't the future brighter in this case? How about the 7-days week? It is just used and boring...