@Riachu
Yes, most action games that were hard, were also really short, but RPG in those days were also just as hard. The original Dragon Quest, Final Fantasy II, Crystallis, Fanaxadiu (misspell?), those were really long games, and really really hard, like goblin killing you in one hit, hard xD
Also i've just remembered about Battletoads, that game was hellishly difficulty and really really long, it had more than 12 stages, each with 2 or 3 parts.
The most recent game that I remember to be just as hard was, IMO, MGS4 in Big Boss difficulty.
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