dykstrl - Thanks, but it's already in Landscape.
BobWeaver - Actually it's about a total of 1200 fields, located in several tables.
The reason why I want it so big, is I want a 20 A4 page report (and it would have to be portrait). It's currently 20xA5 pages (printed on landscape A4) to make a booklet, but it would be much easier if I could let the photocopier reduce everything for me, so it could do all the folding/stapling in one run, rather than having to put all the paper back through again.