It took four or five days for the space-time partner to receive the text message.

Within 14 days, a citizen's phone number stays in the same time-space grid (800 m× 800 m) for more than 14 minutes, and in the recent 14 days, the accumulated phone number of any party stays in the time-space grid for more than 30 hours, so the citizen is generally a time-space companion of the risk population.