The acclimatization programs included in our Iran trekking tours and Iran mountain climbing tours are designed based on years of experience gathered by mountain climbers, instructors, and tour operators. You won't have any problems if you're in good physical shape and pay attention to your Iranian mountain guide. In general, we spend 2-3 days gaining and losing altitude before summiting Damavand. You can check the details reading each Damavand tour package itinerary.