eight hour shifts allow for a more planned life style, child care is easier to take care of. but, unless you work week ends, getting things like doctor appointments and oil changes done can be very challenging. it is better for family life really. ten hour shifts are also nice, you have three days off to get those things already spoken of done. Finding child care can be hard though. the sitter is watching your children at least eleven hours. Either one will not take that much toll on you physically though. Currently I work three twelves a week. I find myself using those days off to recooperate. twelves are just too long. I have worked all of these kind of hours. Eight hours is best. Ten is okay. Hope I helped.