It gave us a change to know the number before going in the studio. John Bonham and Robert had been in the studio before for a couple of things. It wasn't like anyone was going in there for the first time. Everyone got swept away by the energy of it. In Through the Out Door was done in three weeks, so I can't see why people have to take so long to do an album.
Presence is quite a technical album.
I don't know why people take two years to do an album. I wouldn't have the patience for it - I'd get fed up. That's why you hear about people doing an album and taking two years to record it - and it's stale. There's never been anybody since. He's one of the greatest drummers that ever lived.