Is one week enough for Serbia?
Yes, one week is enough for a good Serbia trip, but not if every day is a new region. Belgrade, Novi Sad and one slower extension usually beat a frantic loop across the map.
Answer
A good one-week Serbia trip has a clear centre of gravity. Belgrade deserves more than a rushed arrival night, because the city works through meals, cafés, river walks, late evenings and neighbourhood texture rather than one perfect sight. Novi Sad is the easiest contrast: close enough to add without breaking the week, different enough to matter. After that, choose carefully. Subotica and Palić suit a slower Vojvodina mood; Niš can make sense if you are heading south; Tara, Uvac or Đerdap need more logistical patience. The mistake is thinking a small country automatically means quick travel. Serbia is manageable, but not frictionless.