At least you need 7 parts of the treasure map to find the Blade of Destiny and the attack plan from the Orcs, which can be find in the orcish cave between Skelellen and Phexcaer. With this attack plan your group is able to find the Orc-Camp between Phexcar and the lonely lake where the anchorite lives. You still have enough time to find 8 pieces of the map. Finding the ninth part depends on a random encounter and cannot always be discovered. When you get the message that something on the map can be decrypted you'll have enough parts to find Hyggelik and Grimring. Not later than 2 years and 10 months after beginning you need to get to the Orc-Camp and defeat the Orc-Champion, otherwise the game is over. The date when the orcs will raid the land is(in the german version) the 27th Peraine, 17 Hal. When you have Grimring and the attack plan you can dally around but always keep an eye on the calender.