let
    Источник =
        Table.Group(
            Excel.CurrentWorkbook(){[Name="Таблица1"]}[Content],
            {"FIO"},
            {
                {
                    "МИН(timeStart)",
                    each Time.From(List.Min([timeStart])),
                    type time
                },
                {
                    "МАКС(timeEnd)",
                    each Time.From(List.Max([timeEnd])),
                    type time
                },
                {
                    "МАКС(timeEnd)-МИН(timeStart)",
                    each Time.From(List.Max([timeEnd])-List.Min([timeStart])),
                    type time
                }
            }
        )
in
    Источник