今天我做了一道英语阅读（高一）,

今天我做了一道英语阅读（高一）,
这句话所在的段落是：
“Children are affected by the same time crunch(危机) that affects their parents,and the reason is that more mothers are working outside the home,”says Sandra Hofferth,who headed the study of children's timetable.However,compared with the children in“double-income”,these children in“male breadwinner”spend more time interacting(互相作用,互相影响) with their parents 22 hours and 19 hours respectively.In contrast,children spend only 9 hours with their single mothers.
不明白的那句话是
However,compared with the children in“double-income”,these children in“male breadwinner”spend more time interacting(互相作用,互相影响) with their parents 22 hours and 19 hours respectively.
那句话里的22 hours和19 hours分别指什么？