The question behind the question
When people ask how many days Mostar needs, they are usually asking one of two things: whether a rushed day trip is enough to feel like they have been there, or whether staying longer adds enough to justify the time. The answer to both is more nuanced than a number. Mostar can be done in a few hours and feel complete at a surface level. It can also easily absorb three days if you use it as a base for the Herzegovina region. The number of days you need depends entirely on what you want the trip to do.
One day (day trip): what you get and what you miss
A full day trip to Mostar — arriving by bus around 10am and leaving by 5-6pm — gives you Kujundžiluk bazaar, the Stari Most bridge, lunch at a river-view restaurant, and maybe a walk to the western bank of the river. This is a valid and commonly done version of Mostar. You will photograph the bridge in good light, eat well, and leave with a clear sense of what the city looks and feels like.
What the day trip misses is harder to quantify. The bridge at dusk, when the daytime crowds have thinned and the old town settles into evening, is a different experience from the bridge at noon. The residential streets behind the tourist center — quieter, more local, genuinely interesting — take time to find. And the day trip version of Mostar always ends with the bus rather than with the city, which changes the pacing in ways that become obvious only after you have stayed overnight.
One night (two days): the minimum recommended stay
One overnight changes the Mostar experience materially. You arrive, see the bridge at midday crowd levels, and then see it again in the evening when most day-trippers have gone. The difference is significant enough that the overnight stay is consistently recommended by people who have done both versions. One night also gives you a full morning before checkout, which is when Mostar is genuinely at its most atmospheric — the river catching early light, the cafes quiet, the lanes empty.
With two days, you can cover the old town properly, walk across to the western bank and the Bulevar (the former front line of the 1990s conflict, now a regular city street), and eat at least one proper meal at a local restaurant away from the main tourist strip.
Two nights (three days): the ideal for Herzegovina
Two overnight stays unlock the best version of a Mostar trip: the city itself plus the surrounding region. Blagaj, 10km south, has the Dervish tekija monastery built into a cliff above the Buna spring — a half-day trip that stands on its own as one of the best sites in Bosnia. Kravice waterfalls, 40km southwest, work as a longer day trip and are one of the most photogenic natural sites in the country. The Herzegovina wine region surrounds both stops and makes the logistics of either trip more enjoyable with a glass of Žilavka white or Blatina red at the end.
The honest recommendation
If you are coming from Dubrovnik or Split on a tight schedule, a full day trip is enough to see the bridge and feel the old town without wasting a night on an overnight stay you cannot fully use. If you have any flexibility at all, one night is the right call — the difference in experience is disproportionate to the cost of one extra night in Bosnia. If your trip has Herzegovina or southern Bosnia as a real focus, two nights with day trips to Blagaj and Kravice make Mostar one of the strongest short bases in the Balkans.