Stol is the highest mountain in the Karavanke range with 2236 meters. It is a mountain that I am watching from my window every morning and I hike every year at least once.
The starting point is at Valvazorjev Dom and it takes 3 hours to hike at the top (It can take in 2 hours or less if you are in good shape). Mount Stol is the border between Slovenia and Austria. The views on top are great. You can admire the Julian Alps with Mount Triglav, Karavake range, the valley and the valley on the Austrian side with Klagenfurt and adjacent lakes.
The best time to hike is for sure summer. It can be windy so never forget to bring more layers of clothes. AND WATER to hydrate yourself!
And do not forget to enjoy!