I took off four days and it was fine, albeit a bit pushed for time. But I had my hen's night on Thursday, plus lunches on both Thursday and Friday with friends and our rehearsal on Wednesday.. plus I did the following:
Got my cakes ready (filled and iced) - 4 served as dessert - choc mud and fruit cake
Baking and icing cookies for bon bons - 160 all up.
Making and printing seed packets for bon bons
Putting all bon bons together
Picking everything up - all equipment, extra items, flowers etc, inc a moving truck!
Decorating my wedding cake - as in the cake photo one (separate one to serving ones)
Finishing off all our diy jobs - we made just about all the decorations etc...lots of painting and stuff
All my appointments took a long time - hair colour, waxing, nails etc.
Organising and discussing our set up with our 'set up team' - our family and friends
Plus heaps of other random stuff that came up. We honestly had about 6 hours sleep a night from Wed on!
I don't think most people need a week. Sure it would be nice, but unless you are baking, diy'ing etc, I really don't think you need a whole week. Although you probably will need to leave early throughout the week (or get late appointments) to get all your beauty appointments in such as the nails, hair etc. A day (or two, which would be better) would be sufficient for most people I think.
Hope that helps.