How many years does Yoda trains Jedi knights?

Answer 1

About 800 years.
He says this in either Return of the Jedi or the Empire strikes back.

Answer 2

since the age of 100, when he became a jedi master

Answer 3

in the fifth movie, he said to Luke,"800 years have I trained jedi..."

Answer 4

"For 800 years, have I trained Jedi" - Yoda

According to Return of the Jedi Yoda has been training Jedi for 800 years until his death. Luke Skywalker was the last Jedi he ever trained.

Answer 5

Ever since he was 100 years old and he trained Jedi Knights for 800 years

Answer 6

15 years his master is unknown

Answer 7

around 800 years