Syag in theory it can
However generally there will be other issues that arise, most commonly infection leading to sepsis and septic shock.
In actuality I dont know of the longest case of hand. There is generally little desire to keep patient that way OTherwise the issue becomes who should pay? The hospital and insurance comapnies wont pay for the ventilation of what is legally a cadaver. The family never wants to. unless there is a compelling reason to do so, for example pregnant women have been kept on “life support” for months while brain dead for the benfit of the fetus. (this is what prompted the sheep experiment in Israel where a pregnant headless sheep gave birth while on “life support”)