What is the time frame for small foreshocks that precede a major eathquake occur

Scientists can't tell that an earthquake is a foreshock until the larger earthquake happens. The largest, main earthquake is called the mainshock. Mainshocks always have aftershocks that follow. These are smaller earthquakes that occur afterwards in the same place as the mainshock.

answer; /// during daylight hours the sun heats up the ground,and at night the clouds insulate the warmth making it warmer ;