The honest answer: two days is the sweet spot. That's enough to see the essentials of the old town and Anping without rushing, while still leaving room to sit down, eat well, and feel the city's slow rhythm, which is the whole point of Tainan. One day works as a taste if that's all you've got, and three or more lets the city really open up. What I'd gently push back on is treating Tainan as a half-day stopover on the way between Taipei and Kaohsiung. It deserves at least an overnight.
One day: a taste
Doable, but you'll be choosing. One day lets you see the heart of the West Central old town: a couple of the major temples, Chihkan Tower, a wander down Shennong Street, and a proper street-food lunch. You'll get the flavor of Tainan and a strong urge to come back. Best treated as a day trip from Kaohsiung, or a single full day if your schedule is tight. → A 1-day Tainan plan
Two days: the sweet spot
This is what I recommend to almost everyone. Two days lets you give the old town a full, unhurried day (temples in the morning, food and old streets through the afternoon and evening) and dedicate a second day to Anping, ending at the harbor sunset, with time left over for a museum or a long lunch. You leave feeling like you actually met the city rather than ticking it off. → The 2-day Tainan plan
Three days or more: the deep dive
Three days is where Tainan gets indulgent in the best way. Add the museums (Chimei out by the HSR, the downtown art museum), go deeper into the temple culture, take a half day out to the Sicao wetlands or further afield, and spend real time just eating your way through neighborhoods. This is the pace the city is built for, and the one I'd choose myself. → A 3-day Tainan plan
So, how long?
- Tight schedule or a side trip from Kaohsiung: one full day.
- Most visitors: two days and one night, minimum.
- Food lovers, history lovers, slow travelers: three or more, and you won't be bored.
We think 3 days is the perfect amount if you need to set a limit. With three you can hit most of the top spots and still keep one day free for something special, like heading out to the coast for an oyster tasting.
A note on pace
Whatever you choose, resist the urge to over-schedule. Tainan's pleasures are unhurried: the lingering breakfast, the temple you wander into by accident, the second coffee in an old house. Build in slack. The best moments here are the ones you didn't plan.