rack time การใช้

• Alternatively, candidates may rent " rack time " online.
• He made the rack time 10 p . m . to 6 a . m.
• Concern about sleep deprivation led the U . S . Navy last April to change the " rack time, " or sleeping hours, for young sailors _ many of whom are in their late teens _ at the Great Lakes base in Chicago, where all basic training is done.