Lunch is not the most important meal of the day in the US. For most people lunch time is squeezed in where it can be, the 30 minutes given to them by their job or before their next class.
the 30 minute...学校老师给我分析的是lunch time同位语,但我不这么认为,同位语应该跟在lunch time的后面用逗号隔开,所以我认为the 30 minute...应该是where从句中be的表语,只是被逗号隔开了,但我也不确定,希望专家解答并翻译一下,感激不尽!