The more involved the edit, the fewer pages an editor can complete per hour, and the more your project will cost. Depending on their level of experience and the level of edit required, an editor may charge anywhere from $15/hour to $100+/hour. A side note about the level of edit required: I have found the level of edit required can occasionally be a touchy subject with writers.
'Oldest living thing on earth' discovered. Ancient patches of a giant seagrass in the Mediterranean Sea are now considered the oldest living organism on Earth after scientists dated them as up to 200,000 years old. Scientists say a patch of ancient seagrass in the Mediterranean is up to 200,000 years old Photo: Getty Images. By Jonathan Pearlman, Sydney.
1 A bristlecone pine is the oldest tree in the world.  2 Adonis, A Bosnian Pine living high in the mountains of Greece, is Europe's oldest officially dated tree, at 1,075 years. 3  Called Old Tjikko, this 9,550-year-old trunk from a clonal Norway spruce is a record-breaker.