Speed 27km 770m elevation hike and lake

Speed hike 6km/h. 27 km and 770m elevation.
2 loops 16-11 km and we stay to swim and chil after the hike.
Be sure you can hold the speed! And charge your phone in case to find the way back on your own 😱
Grab your hat, sun real, water and quick sugar some food.
And if you stay after the hike you will need a swimming suit.
Cheers
Ps: be ponctual pls as it will be around a 5h - hike so we cannot wait