| Characteristic | Four to six hours | Seven to 10 hours | More than 10 hours |
|---|---|---|---|
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
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Sources
Release date
December 2017
Region
Worldwide
Survey time period
December 2016
Number of respondents
316 respondents
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