Scheduler: Show Business hours per Ressource

You can change the cell background using OnBeforeCellRender method:

protected override void  OnBeforeCellRender(BeforeCellRenderArgs e)
{
  if (e.Start.Hour > 5 && e.ResourceId == "5") {
    e.BackgroundColor = "#ffffff";
  }
}

or

protected override void  OnBeforeCellRender(BeforeCellRenderArgs e)
{
  if (e.Start.Hour > 5 && e.ResourceId == "5") {
    e.CssClass = "customclass";
  }
}