Shared Parenting Time (formerly shared custody) is when overnight paretning time with the children is substantially split. Once a parent has more than 40% (146) overnights per year, child support is typically reduced. There are ways to deviate frm that guidline but you shpould cnsult with an attorney about that possibility. This tool may help calculate the total average overnights for weekly parenting time when parents have different overnight schedules from week to week.