Canon PowerShot A560 Advanced User's Manual page 38

Since the recording pixels are few and the data size is small, this
mode is convenient for sending movies as e-mail attachments or
when the memory card capacity is low.
• The recording time will differ according to the memory card used
(p. 115).
* Even if the size of the movie data has not reached 4 GB, recording will stop
when a shooting time of 1 hour has elapsed, Depending on the storage
capacity of the memory card and the speed at which the data is written,
recording may stop before reaching 4 GB or 1 hour,
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