Harvard astronomers calculated that if any transmissions from Earth were heard by an extraterrestrial technological civilization (ETC), it would take about 3000 years to get a reply.
https://www.universetoday.com/152112/well-have-to-wait-about-3000-years-for-a-reply-from-intelligent-civilizations/
https://www.universetoday.com/152112/well-have-to-wait-about-3000-years-for-a-reply-from-intelligent-civilizations/