In the menu of the camera, under the tools tab, you will find an option for [Power Saving]. If you disable it, the camera will not power itself down automatically. You can find this on page 148 of the manual. If you do not have the manual, I have provided a link below to our website where you can download it:
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2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM