Our Trip was confirmed the other day. Everything went well. I'd expect to have more time in Sibenik (we had 1hr 20 mins) and maybe less in KRKA (we had 3 hrs, but 2 hrs is enough for walking around and a lunch). Unless you wanna take a boat trip to island, that would only take 2 hours.
The bus was a comfortable 20-seats Mercedes, so no complaints.
Ekaterina P., Czech Republic
On excursion: Krka Waterfalls and Šibenik Day Trip from Makarska Riviera