What would be a good way to describe computational power that is too large or requires too long of a time? [duplicate]

"The problem requires inordinate computational resources."

Inordinate : exceeding reasonable limits

Merriam Webster

Drainage system : Inordinate Delay Sparks Protest

Kashmir Age - 22 August 2020


This for entertainment more than application: I had a colleague who labeled some problems/project proposals as "end-of-universe." He explained that in physics there are some things that are in principle possible, but to complete would require more time than the universe will exist. It was not uncommon, when another manager proposed some particularly spectacular computer adventure, for him to say, "That's an end-of-universe idea, but we can get right on it after (FTL is invented|the Higgs boson is harnessed|some other mysterious thing)."