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I dunno, that seems more like the outside person gave them an insane deadline, then they somehow pull it off. The one I'm talking about, the person doing the hacking claims it's going to take a long time (or alternately someone tells them it will), then is almost immediately done.
An example I'm thinking of, is on a recent episode of Scorpion. Ralph is trying to hack into the biodome's security. Head guy for the biodome is like "That's cute, son, but we have a state of the art securi-" "I'm in."
Or on The Great Indoors, Emma was asked to track someone's movements. "Wow, that's a tough one, that could take awhi-done."
I know of another example from The Abominable Bride which is currently listed as Instantly Proven Wrong: Mycroft tells Sherlock it would take weeks to find out where Emelia Ricoletti was buried, only for Mary to interrupt him telling that she just found the information in the MI-5 archive.
Edited by eroock
Would that fall under Hollywood Hacking?
What's the trope when a character is asked to search for/hack something, and they're like "Wow, a system like that could take awhile...done!" Getting into the system in seconds when it was supposed to take several minutes or even hours.