If you're away on time off (e.g.: Vacations or Parental Leave), you probably don't want Nikabot to be asking you what you did every day.
The first time Nikabot talks to you while you're away, just select the right option from the list. She will then give you the chance to enter a return date and not bother you until you're back. Your logs for those days will all be entered automatically.
Please not that only some Time Off options support setting a date range, it's up to the admins to define which ones. By default, Public Holiday and Day Off only allow logging single days.