The "minimum time" for a stopover varies based on whether you are simply connecting or leaving the airport. For a standard connection (staying airside), the minimum is usually 45–60 minutes for domestic and 90–120 minutes for international flights. However, if you intend to actually leave the airport for a "mini-vacation" (a true stopover), experts recommend a minimum of 8 to 10 hours. This accounts for the 1–2 hours needed to clear immigration and customs, the 1 hour to travel to the city center, and the requirement to be back at the airport 3 hours before your next flight. In 2026, with the implementation of more biometric "Smart Borders" in cities like Singapore and Dubai, these exits are faster, but a 12-hour window is still the safest "sweet spot" to ensure you don't miss your onward journey due to traffic or security delays.