Hi Olly,
Got to take Debbies side on this one, it always gets me why holidays are advertised as "x" number of days when I actually count the nights we are in our hotel and not travel only days.
Saying that virtually all companies do the same so its not unexpected, so just work it out before booking.
It would be much clearer to say its a 14night holiday instead of 16days or at least only count the days you are actually in your destination (15 in this case).
Mick