11.   People with an insanity defense spend an average of six, nine years in a mental institution.

12.   Return visits to the Chicago store are higher and shoppers spend an average of one hour longer than they do at other IKEA stores.

13.   The children who are adopted spend an average of three and a half years to five and a half years in foster homes before finding permanent homes.

14.   The patients spend an average of six months in the device and three more in recovery.

15.   Visitors spend an average of an hour and a half mastering the maze, though they often try to beat the odds.

16.   Visitors spend an average of four hours there, compared to one and a half hours at a typical mall.

17.   Women spend an average of eight hours each week cleaning, while men spend less than two hours, the study found.

18.   Yearlings spend an average of five months in a feedlot before being shipped to the packing house.

19.   Britons also spend an average of five minutes a day reading magazines, the survey found, and two minutes perusing reference works.

20.   Children caring for themselves spent an average of six hours per week doing so, Census analyst Kristin Smith said.