I'm going to answer you as a mom who has to split time with exh and as the mother of a boy who has good friends who never spend more than 2 days at one parent's house.
As much as I hate the every other week, and I know my son also isn't crazy about it, neither my son nor I can fathom how my boy's friends can move from house to house two or three times a week. It's disruptive. It's not conducive to a healthy life.
I strenuously encourage you to look at an alternative. Ask the boys what they would prefer, if you think that is helpful. If you are to split time, make it every other week versus this insane plan your stbx has concocted.
And, as a woman who has son EVERY saturday night - DON"T do that.
xoxoxo
M 20+ T25+ S ~15.5 (BD) BD 4/6/15 D 12/23/16
"Someone I loved once gave me A box full of darkness. It took me years to understand, That this too, was a gift." ~ Mary Oliver