If using a tablet to view a reference photo for painting, you may need to adjust the length of time that the display will stay active.
iPad: Settings ; Display and Brightness ; Autolock ; choose from the times listed.
Times available are 2 mins, 5 mins, 10 mins, 15 mins (also Never, but best not to use this option in case your tablet is stolen).
Other tablets should have similar options in their settings menu.
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