You might be wondering exactly how a "day" is counted. This is especially important for SGEs who serve on more than one advisory committee, work at more than one agency as an SGE, or perform Government work outside of their usual SGE working day (e.g., doing committee "homework").
Generally speaking, any day on which you perform any work for the Government for which you are compensated should be counted as a day, regardless of the amount of time worked that day or the nature of the services.
However, uncompensated activities limited to strictly administrative matters, uncompensated brief communications, and uncompensated brief periods of reading or other preparation performed at a setting away from a Government workplace, need not be counted.
For more information, see "Counting Days of Service for Special Government Employees" from the Office of Government Ethics.