If it hasn't finished by now, take a well deserved weekend break away

Actually, it also depends on your machine spec - I used to have an 'older' machine with only a 180Gig internal drive and it took (on average) 15 hours to complete (not even sure if that was a deep scan or not). That said, I have a modern machine with a 320Gig external drive - still takes the guts of 8 hours to complete (that said I normally set it scanning last thing at night and it 'usually' has completed by the time I head out to work, so it may be quicker)