How much warning could a "real-time earthquake warning system" provide before destructive seismic waves arrive?

Question

Quizplus · Accepted Answer

Real-time earthquake warning systems can provide warnings seconds to minutes before the seismic waves from an earthquake arrive at a location, but they cannot provide hour-long or day-long warnings. The exact amount of warning time depends on the distance from the earthquake's epicenter and the system's speed in detecting and analyzing the earthquake's initial signals.

How Much Warning Could a "Real-Time Earthquake Warning System" Provide