As well as Terry's point which my browser won't let me read. . .
From the latest (April 2012) WT, page 23:
Seven days before the floodwaters
fell—just enough time for Noah and
his family to load the animals into the
ark—Jehovah finally told Noah exactly when the Flood would begin.
so we don't know how many animals - or how God teleported them to Noah's doorstep - or how the neighbours viewed these strange events (why wouldn't they repent and ask for a lift?) - or why the animals didn't eat or squash each other during the week . . .
But the GB knows that it took "just" a week to load the Ark!