How long can my Tibet travel permits be valid? and can I have the permits valid as long as I wish? The answer is “YES”. As a well-experienced and responsible Tibet travel agency, we can guarantee that during the time of your schedule with us your TTB Permit will be valid. If you want to change your schedule, please let us know in advance. We need time and extra efforts to rearrange your tour. If you arrive Tibet earlier than your scheduled date, this will be an urgent situation and we will charge extra service fee to reapply for your TTB permit. If you arrive later than your scheduled date, we can extend your trip for a few more days (normally 2-5 days) to help you finish the scheduled trip.