I climbed this ferrata a month ago.
It's very nicely routed, especially on Cjajnik. For the tour you need some more strength in your arms, definitely don't forget gloves. Start at Košuta Haus, then new ferrata to Cjajnik, from there to Košuta ridge (Učnik), and along the ridge to K.Turn.
From there back a bit and down OTK Sreig. The ferrata on Cjajnik and descent from it takes about 1.5 hours. From K.Turn a good half hour. Whole tour 7-8 hours.
Since the entry from the screes to Cjajnik ferrata is very hard to find, there is a board before Košuta Haus of the whole route.
Regards