Most rooms take around two days to pack, but sometimes you also have to do other 'chores' such as repairs, painting, or replacing old or worn items before moving. Some people do that whilst planning to move, others move out and leave their house for a landlord or landlady - others still move from one housing association house to another.
It's important to also remember that you will NOT want to pack your whole house in a week, given the choice. Packing is dull for most people - it takes a lot of time that you might want to spend elsewhere. And while it, and de-cluttering while you go, is an essential aspect of moving, there are a few things you can do to make the time go faster.
Clear out your biggest cupboards first - you can store boxes and other packed items in there - and those cupboards may just be full of clutter too - once you've cleared the cupboards, sweep and wipe down the surfaces and then use those cleared spaces for the boxes you're not using now and won't use until after your move. Pack items you know you won't need first - it might seem obvious, but packing up and pouting away your winter clothes in summer, or putting away your hobby stuff stored in the bottom of your closet is a must.
It means you're not living out of boxes for the duration of your packing, and it also means that you'll be able to store those boxes. Get rid of your children's old clothes and toys BEFORE you pack - its easy to pack around small children, harder to sneak their favorite outgrown things into the bin whilst they aren't looking.
It's important to remember though that space wins over sentimentality, every time, and if you're going to keep something ensure its for the right reasons. Packing might take a while, but remember, if you're organized and mark your boxes while packing, your unpacking won't take nearly as long.