My mental illness is sufficiently severe that I need months, not days, to unpack and unwind, and I haven't felt not-burnt-out in about half a decade. I only get to do this between jobs.
I'm glad that this situation worked out alright for the employee, but there often isn't enough sick leave available.
I would think true mental health accommodation would involve long periods of leave, or limited hours, or limited days (e.g. 3 day work-weeks) or all of the above. Not many businesses are setup for that.
The average person in the Netherlands works 25 hours a week, yet they still have a higher GDP per capita. Not per hour, just overall. They work less, yet generate more.
https://en.m.wikipedia.org/wiki/List_of_countries_by_GDP_(PP...
Generally small and/or resource rich countries tend to have a high GDP per capita, so comparisons usually aren't very fair.
To find such approaches, you have to do a lot of personal investigation, reading forums, talking to people, etc. My suspicion is that formal mental health practitioners would rather you came in for regular, recurring one hour sessions for years, rather than pointing you in this direction. But that may just be the cynic in me.