You can extend your stay in Iran for another 30 days. This process can be done twice, so you can stay a total of 90 days after extending your tourist visa. Extending your stay in Iran is possible if you have a visa on arrival (VOA). The VOA is initially valid for a stay of up to 30 days but can be extended for an additional 30 days. This process can be repeated once, allowing you to stay in the country for 90 days. If you need to stay in Iran for longer, you may need to apply for a different type of visa. It is important to note that the process for extending a VOA may vary depending on your location within the country and the specific circumstances of your visit.