3 days is right for Seville, 4 with Córdoba by high-speed train

Day 1: the Alcázar at opening, then the cathedral and Giralda

Day 2: Santa Cruz early, Casa de Pilatos, Plaza de España late

Day 3: the Setas in the morning, then Triana for the evening

July and August: add a day, as about 2pm to 6pm is lost to heat

Córdoba needs a full day: the Mezquita at opening, then the Judería

Two days works outside summer; one- to five-day plans in the guide