Hours: I started at Vršič at 5am, went under the north face of Prisojnik, entered and climbed the route through the window, then along the ridge to the top and from there further through the small window, under Razor to Križke pasture and down to Zadnjica to the car, arrived there around 9 or 9.30pm. So a one-day long tour.
But there's a catch: if you're afraid of heights etc.. from the small window towards Razor you climb literally vertically down, otherwise for me the chimney before the window was worse because I got stuck with a big backpack, because I was three days in the mountains last time and this was the last tour.