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One day is enough for Heidelberg if you keep the plan compact. This itinerary runs from the Altstadt up to the castle, back down to the Old Bridge, and across the river for the classic viewpoint, with clear choices between free streets and ticketed interiors.
Two days in Heidelberg give you the castle hill, the compact Old Town lanes and one deliberate half-day on the water or in the hills. This plan anchors day one on the castle, keeps day two slow along the Neckar River, and explains when swapping a Heidelberg day for Frankfurt is worth it.
