These are all my estimates, but they are probably fairly close:
SNES: Super Mario World (~10 hours)
N64: Super Smash Bros (~300 hours)
GCN: SSB: Melee (~500 hours)
Wii: SSB: Brawl (~300 hours)
Wii U: NSMB: U (~5 hours)
PS2: GTA: San Andreas (~50 hours)
PS3: Black Ops (~100 hours)
GBC: Pokemon Silver (~200 hours)
GBA: Pokemon Ruby (~150 hours)
DS: Pokemon Diamond (~100 hours)
3DS: Zelda OoT (~35 hours)
Nintendo still doomed?
Feel free to add me on 3DS or Switch! (PM me if you do ^-^)
Nintendo ID: Mako91 3DS code: 4167-4543-6089