40-50 year time horizons are definitely how Company Boards think. Naturally, closer in time periods have greater weight. However, the NPV time horizon of Company Boards is measured in decades.
You think someone approving construction of a new factory or office building is thinking short term ?
The further down one goes in company management the shorter the time frame until one gets to front line supervisors who think in terms of a couple of shifts.
Board members are almost universally in the latter part of their careers, they are often pals of the CEO, who is looking at annual compensation-tied goals more than anything and more than anything is smoothing things quarter to quarter.
Sure, there’s an occasional debt and investment issue that is justified over decades, but that is not the actual mindset of such folks. And in the tech world? Then three years is a long-term plan.