When studying at a higher education institution in Denmark you have the right to work 20 hours a week outside of your studies (and full time in June, July and August).
When studying at a folk high school you do not have the right to work. As an intern (agriculture) you have the same rights as Danish interns, for example a weekly work time of 37 hours and an hour salary at min. 71.38 DKR and also food and accommodation or an extra payment if that is not provided