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No, not at all. You can attack their attack position monsters first if you want.
The duration of All Monsters Attack is 1.15 hours.
All Monsters Attack was created on 1969-12-20.
Yes, but you have to attack one at a time. Now if your talking about attack one monster with all your monsters the answer is no.
He has 4000 attack power. His effect is you discard two monsters you destroy all monsters on your opponent side of the field.