Schedule

IF(
  AND(
    GTE(
      INT(
        FORMAT_TIME(
          "%H",
          SUB(
            EVENT_TIMESTAMP(),
            28800
          )
        )
      ),
      6
    ),
    LTE(
      INT(
        FORMAT_TIME(
          "%H",
          SUB(
            EVENT_TIMESTAMP(),
            28800
          )
        )
      ),
      16
    )
  ),
  "on-hours",
  "off-hours"
)