Canon EOS RP Mirrorless Camera - Manual (Page 255)

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Setting the Movie Recording Size
Total Movie Recording Time and File Size Per Minute
For details on file sizes and the recording time available at each movie
recording size, see = 586.
Movie Recording Time Limit
The maximum recording time per movie is 29 min. 59 sec. Once 29 min.
59 sec. is reached, recording automatically stops. You can start recording
a movie again by pressing the movie shooting button (which records the
movie as a new file).