Quick answer: 5–7 days covers Jordan’s highlights — Petra, Wadi Rum, the Dead Sea and Amman.
Jordan’s big sights are spread out but close enough for a one-week loop.
How many days, by trip type
3 days
Petra and Wadi Rum, the two unmissable sights.
5–7 days (ideal)
Add Amman, Jerash, the Dead Sea and a night in the desert.
8+ days
Aqaba’s Red Sea diving and a slower pace.
The ideal length
Five to seven days is ideal, with at least a full day for Petra and a night in Wadi Rum.