Spending at least 120 minutes a week in nature is associated with good health and wellbeing
https://www.nature.com/articles/s41598-019-44097-3
"... found that women recently diagnosed with breast cancer scored higher on several attention tasks, compared to standard care controls, following a five-week period of spending 120 mins per week in ?natural restorative environments?. The authors argued that the 120 mins per week of nature exposure helped the women restore cognitive resources depleted by the stress of their diagnoses and early treatment. ..."