From the busstop on top of the mountain where the national park bus stops it is normaly easy to walk up to the peak. Less than 3 hours active walk should be ok. But if the weather is not ok it is not nice to be on the top. We were a group of 12 people and used 2 1/2 hour active walking and 1 1/2 stop time to the top, see gps trackphoto. Enjoy the lunch in a ruin of old stone shelter on the top is nice, and the mountain goats are eager to have some food also....enjoy.