which is better?

1) a 10-day week which alternates 3 days of labour and 2 days of rest

2) a 10-day week with 6 straight days of labour and a 4-day weekend

3) an 8-day week with 5 days of labour and a 3-day weekend

4) a 6-day week with 4 days of labour and a 2-day weekend

reply) some other week configuration which evenly divides 40 or 30