A week is normally ample time to see everything that one particular country has to offer but this is not always the case because overall, it is due to the size of your chosen destination and the history that is associated with it.
It is always best to allow plenty of time to see what there is to offer because it happens all too often when you find the best attractions/sights on the last day and this can mean disappointment. Always plan a trip ahead and this will save a lot of time and upset.