Hulk
The Hulk's physical durability remains legendary within Marvel mythology. His cellular regeneration enables recovery from virtually any wound, whilst his gamma-enhanced musculature provides resistance to conventional weaponry, extreme temperatures, and tremendous physical force. He has survived encounters that would annihilate lesser beings.
Yet the Hulk's existence depends upon continued creative interest from Marvel's publishing and entertainment divisions. Should commercial viability decline, his presence would fade from cultural consciousness within a generation, reduced to nostalgic references in media history programmes.
Procrastination
Procrastination demonstrates a durability that operates on evolutionary timescales. Archaeological evidence suggests that humans have struggled with task avoidance since the emergence of organised society. Ancient Egyptian hieroglyphics contain complaints about workers delaying projects, indicating procrastination's presence across recorded history.
This behavioural pattern appears hardwired into human cognitive architecture, likely serving adaptive purposes in ancestral environments where energy conservation proved crucial. Unlike fictional characters, procrastination cannot be discontinued, rebooted, or reimagined out of existence. It shall persist as long as consciousness itself endures.