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Hello Best Buy customer Austin and thank you for asking this question as an answer may not only help yourself, but there have been other Best Buy customers who have been interested in this Insignia 43" LED TV whom have had similar concerns about the TV's sleep timer. Here are the steps you can take to get this TV to shut off on its own within thirty (30) minutes after you turn it on => please click onto the MENU button on the TV's remote control => scroll to the right to "SETTINGS" => scroll down to "TIME" and click the okay button on the TV's remote control => scroll down to "SLEEP TIMER" and click okay => you will then be given the options to select "OFF, 5, 10, 15, 30, 60, 90, 120, 180, 240 (i.e., minutes!)" => after making your selection, please click the "EXIT" button on the TV's remote control. I know that you only asked about setting your TV's shut off time to be set at thirty (30) minutes; however, there may be other Best Buy customers out there who want to know about the "long" list of other auto shut off time opportunities that this great TV has. One "final" point that I'd like to make is: whenever you "resume" your TV viewing on this TV, please don't forget that it will keep shutting itself off at your preselected time--unless you repeat the above procedure and select "OFF" which will indicate that the TV's SLEEP TIMER is "not" in use. Happy TV viewing Best Buy customer Austin and I hope that you enjoy this sleep timer feature and all of the other great features which this 43" Insignia TV model # NS-43D420NA18 has. I've included a couple of screenshots for your review below also. Thanks!
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Sorry, there was a problem. Please try again later.Yes there is a sleep button on the remote that will set it to turn off after a set time period you just have to set each time you cut the tv on
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