Supposedly permanent as long as you don't switch plans or leave and come back(unless there is a welcome promo like the one going on now when you come back on a new account) or until Visible decides to cancel it as per the wording in the disclosure. Last paragraph in the disclosure, second sentence: "Visible reserves the right to change or terminate this offer at any time, with or without notice, including for any violation of Visibleโs terms of service." Could be 6 months or could be 5 years only Visible knows.
