If visitors want to stay longer, they can extend their tourist visa in Nepal.There are some certain conditions to be followed extending their visa.The maximum duration for tourist visa extension is about 150 days. If they want to stay longer they can apply for an extension at the Department Immigration Offices in Pokhara or Kathmandu.
The process is simple, but it involves paying an extension fee. The cost for extending a visa is 45 USD for the first 15 days and an additional 3 USD per day for extra days. It is necessary to apply for an extension before the current visa expires to avoid fines or penalties.
However, if they already stayed in Nepal for 150 days in a calendar year, they are unable to extend their tourist visa and they need to leave their country before returning. The process for extension typically takes a few days.