Some people seem to be missing what seems to be an obvious attempt at (poorly word) humor.
Either way, there have been global top-tier guilds that raid 4 nights a week for 4-6hours. Add in farming for consumables (a joke with dailies) and it'll probably be another hour a day if you do dailies everyday.
Then again, good luck finding intelligent people to raid with. The norm is definitely for long raid hours if you want progression. If not, expect long, frustrating raids with casual guilds.
Honestly, having to depend on 24 other idiots to perform is like asking for pain and then pretending you like. If masochism is your thing, feel free to raid in WoW.