九时 nine o' clock

九时十分 ten past nine

睡九个小时 Sleep nine hours ; Nine hours of sleep

九个半小时 nine and a half hours ; nine hours and a half

第九小时 La Nona Ora

第九课时 Main task

第九个小时 La Nona Ora

十九点报时 Time Report

九个小时 nine hours ; for nine hours

当九十岁来临时 On His Ninetieth Birthday