[yannis7]

John D. Rockefeller was managing global oil monopoly and occasionally in the letters to his wife he raised concerns about his "mental strains".

By reading [1] it seems to me that the way he very efficiently coped such immense amount of pressure was through strict sandboxing of his work-vs-personal life and proper delegation to his lieutenants; it gave him ample time to spend with his wife, children, in-laws, his church and his hobbies.

[1] Rockefeller's biography "Titan" by Ron Chernow