Yesterday I was at Kredarica. At 7 I started from Krma - park 1h walk from barrier.
Total to the top took me a bit less than 8h (including the flat).
I put on crampons for the last 100m up because otherwise it's hard to walk - slippery. Buddy who went with boots for automatic crampons didn't put them on.
Calvary drags on until 3pm.
Hut at Kredarica cold as a pig, so we decided not to overnight and headed back same day. Four stayed up and slept over, we started down at 4pm and were at the car at 7pm. We jogged down a bit, on some parts (calvary) even slid down on our butts. You sit down, easily stick the ice axe and slide

.
Damjan, besides proper clothes and shoes for Kredarica you need:
-gaiters
-ice axe
-crampons