White Noise — 10 Hours

White Noise for 10 hours is ideal for extended sleep, all day background, continuous coverage. Ten hours is the YouTube standard - the duration that dominates ambient sound search queries.

White noise contains equal energy across all audible frequencies — from the deepest bass to the highest treble. It sounds like TV static, a fan on high, or a rushing air vent. It's the broadest-spectrum masking sound available, which makes it the most effective at covering a wide range of environmental noise. White noise was the first type of noise studied for cognitive and sleep benefits, and the evidence is extensive though mixed — the Capezuti systematic review (2022) found only 33% of white noise studies showed clear positive sleep outcomes. The Nigg meta-analysis (2024) found white noise beneficial for ADHD cognition (g=0.249) but harmful for neurotypical adults (g=−0.212), suggesting it works for those who need external stimulation but overstimulates those who don't. Many listeners find white noise harsh for extended periods due to its prominent treble content. If white noise feels fatiguing, try pink or brown noise instead.

Ten hours is the YouTube standard - the duration that dominates ambient sound search queries. It provides full overnight coverage with morning margin, or all-day continuous background. Same sleep timer recommendation as 8 hours: for sleep, let it fade after 45-90 minutes. For daytime use, 10 hours covers a full workday plus commute with no restarts needed.