A common rate of travel incuding breaks is 1.5km per hour for inexperienced group is 1.5 to 2 km per hour including lunch and breaks depending on trail condition and section. If the trail is dry, it is relatively flat so you can hike at 3+km per hour. So you say 1.5 km for the tough early section and 2 for the rest you will be conservative.
This means you have about 40-60 hrs of hiking to get done so on a 6 day plan you hike around 8 hrs a day. Again this is conservative assuming heavy packs and bad trail.
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