generate questions: Some clock-shift problems could be avoided by adjusting clocks continuously or at least more gradually—for example, Willett at first suggested weekly 20-minute transitions—but this would add complexity and has never been implemented.
Willett's first suggestion was to change clocks by 20 minutes how often? {sep_token} What drawback would changing clocks gradually add to the process? {sep_token} What could be avoided by changing clocks more gradually more often?