Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 230)

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Movie Shooting 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 shooting a
movie again by pressing the <
A
> button. (The movie will be recorded as a
new movie file.)
z When downloading movie files exceeding 4 GB to a computer, use either the
EOS Utility ( = 482) or a card reader ( = 485). Movie files exceeding 4 GB
will not be downloaded if you perform image download with the function of the
computer’s operating system.