The loop marked with yellow signs from Pirttimäki is about 8 km, so we did some bonus-metres to the south of Sorlampi to get a full 10k. As a bonus we looked at the Giant's Kettles just north of Sorlampi (arrow-marks-the-spot).
Although the weather is warm, around +6C maybe, It's fairly dark around 16-17 already 🙁