Procrastination
The Institute for Delayed Action Studies in Cambridge has documented cases of procrastination extending across entire human lifespans. One remarkable study followed a man who spent forty-seven years meaning to organise his garage. Procrastination requires no physical energy expenditure whilst waiting, making it theoretically capable of infinite patience. It simply exists, growing stronger with each postponed deadline, feeding on the ambient guilt of its host organism.
Crocodile
The Nile crocodile can remain motionless for up to two hours whilst waiting for prey, a feat documented extensively by the Zambezi River Predation Observatory. However, metabolic requirements eventually force action. The crocodile's patience, whilst legendary in the animal kingdom, is ultimately constrained by biological necessity. It must eat within approximately three months or face starvation, a deadline that procrastination has never once been troubled by.