A grueling process being forced upon you by circumstances / management that requires an unhealthy amount of hours, stress, etc to achieve to a (potentially unreasonable) objective by a certain time.

Likely outcome to meet the criteria is burn-out / resignation / death of personnel, especially if repeated.

In the original context, it is of course: https://en.wikipedia.org/wiki/Bataan_Death_March

You continue even though you're doomed to fail.