Canon PowerShot V10 Advanced User's Manual page 65

Movie Recording Time Limit
The maximum recording time per movie is 1 hr. Once 1 hr. is reached, recording stops
automatically. You can start recording a movie again by pressing the Start/Stop button
(which records the movie as a new file).
Caution
The camera's internal temperature may rise and less recording time may be
available after extended movie playback/Live View display.
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