How Many Days Do You Need for Nepal?
Four days can work for a focused Kathmandu or Kathmandu–Pokhara trip when flights reduce road time. Five to six days works for a compact two-city or road circuit. Seven to eight days allows Chitwan, slower Pokhara time or a mountain/pilgrimage extension. The right answer depends more on travel mode than the number of destinations you want to tick off.
Four days
Keep the geography tight. Kathmandu works; Kathmandu–Pokhara can work better with flights than long road sectors.
Five to six days
This is the common sweet spot for a focused first trip or a compact Gorakhpur road circuit, but the itinerary must choose priorities.
Seven to eight days
The trip begins to breathe. Chitwan can get real activity time, Pokhara can get a full day and Kathmandu can extend into the valley.