Maps and messaging for two people sharing a hotspot usually land around 300–500 MB a day if video stays on Wi-Fi.
A normal city day
Ride-hailing, translation, and a few social uploads can push a day toward 1 GB. A 10 GB plan covers that pattern for ten days with a little room left.
Save data on day one
Download offline maps before you fly. It saves data and helps if the first network is slow after you land.