Two or three weeks from Madrid: sizing a long-haul trip
If you are crossing an ocean to get here, the trip is rarely a weekend. A common shape is two or three weeks: Madrid, then the high-speed train south to Córdoba, Seville and Granada, and a few days in Barcelona to finish. That much navigating, ticket scanning and messaging home fits in 10 GB, and the pack lasts 30 days, so an extra week does not leave you short of days.
Shorter or lighter trips need less. A week in Barcelona or Madrid with a day trip or two is a 5 GB trip. Three or four days at a conference or on a long stopover fit in 3 GB, valid for 15 days. Take 20 GB for a month-long Spanish course in Salamanca or Valencia, or if a laptop runs off the phone. The data calculator turns your own plans into a number.