The time lapse in conversations to the Moon from Earth depends on the distance between the Earth and the Moon, which varies because the Moon's orbit is elliptical.

Here's a breakdown:

* Average Distance: The average distance from Earth to the Moon is about 238,855 miles (384,400 kilometers).

* Light Travel Time: Light travels at approximately 186,282 miles per second (299,792 kilometers per second).

* Round Trip Delay: This means that a signal sent from Earth to the Moon and back would take approximately 2.56 seconds to complete the journey.

Therefore, the time lapse in conversations to the Moon from Earth would be about 2.56 seconds.

Note: This is just an average time. The actual delay can vary slightly depending on the Moon's position in its orbit.