How do I change the timer settings on my Duraflame Dfi 550 22?

Pressing the timer button will cycle through various timer settings: 30 minutes, 1 Hour, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H and off (00). Press it to select your desired setting. (Page 3)

From the official Duraflame Dfi 550 22 manual, page 3

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