Canon EOS-1 D X Mark II Instruction Manual page 321

3 Setting the Movie Recording Quality
Movie Shooting Time Limit
When shooting movies other than High Frame Rate movies
The maximum recording time of one movie clip is 29 min. 59 sec. If
the movie shooting time reaches 29 min. 59 sec., the movie shooting
will stop automatically. You can start shooting a movie again by
pressing the <0> button. (The movie will be recorded as a new
movie file.)
When shooting High Frame Rate movies
The maximum recording time of one movie clip is 7 min. 29 sec. If
the movie shooting time reaches 7 min. 29 sec., the movie shooting
will stop automatically. You can start shooting a movie at a high
frame rate again by pressing the <0> button. (The movie will be
recorded as a new movie file.)
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