400
Shakespeare's work was so good that it will be enjoyed by people of all times. He wrote plays and poetry in the 16th century that are still being published, produced, discussed and enjoyed by many some 400 years later in the 21st century. (There was a famous quote made by Ben Jonson when defined, means the above.)
What does Ben Jonson mean when he says, "Shakespeare was not of an age, but for all time?"