Two hours a week in nature: a documented threshold for wellbeing
A meta-analysis published in 2025 in Behavioral Sciences — covering 78 studies — confirms that 120 minutes of exposure to nature per week are associated with better perceived health and significantly higher wellbeing. The threshold is achievable, even in cities.
Two hours. That is the threshold research identifies as significant for mental health — not a full day in the forest nor a week of hiking, but 120 minutes of exposure to nature per week, spread however you choose.
In 2025, a meta-analysis published in Behavioral Sciences synthesised 78 studies conducted between 1990 and 2020. The result is clear: people reaching this 120-minute weekly threshold in nature report better perceived health and higher wellbeing. Below it, associations are less robust.
The mechanisms are measurable. Even brief exposure — however short — reduces salivary cortisol by 21%. Ten minutes in an urban green space is enough to improve mood and reduce anxiety. If an entire urban population reached a minimum of 30 minutes outdoors per week, models estimate up to 7% fewer cases of depression and 9% fewer cases of hypertension.
This is not soft medicine in the vague sense. These are measurable physiological effects, documented in rigorous protocols. And the minimum dose — two hours per week — is surprisingly achievable, even for people living in dense urban environments.
Further reading: Nature as Medicine: What Science Now Measures