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Well, as others have mentioned, anime movies and/or OVAs are usually not associated with the "original" storyline.
From what has been presented from the manga/anime, it is not known how long Kakashi was under Yondaime Hokage's tutelage.
Some points to think about:
- Yondaime died 13 years ago, Kakashi would have been 13 or 14 (this depends on how much time has passed since the start of the Naruto storyline).
- Kakashi graduated the ninja academy at age 5 and became a chuunin at age 6.
- A genin receives a jounin sensei after they graduate ninja academy.
- There has been no reference to when Yondaime became Hokage or how long he served before Kyuubi's attack.
Also, it is not really known if a genin continues training with a jounin sensei once he/she is promoted to a chuunin, but, there's always a possibility.
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