Kindle sleep screen time can't be altered in the normal Kindle menus. After 10 minutes of no activity, the sleep screen appears. E-ink Kindles aren't the best devices for cookbooks IMO, if that is what you're thinking. The small Greyscale screens just aren't the best option for that type of book, not to mention the navigation issues with badly formatted digital cookbooks.
Fire tablets have time-out options, as do other tablets like iPads.
I use the Kindle app on my iPads for cookbooks, and have most of my own recipes in the Evernote app, also on all of my iDevices. I've used e-ink Kindles since 2009, but never for cookbooks or recipes.
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