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We rode hardtails, no regrets imo. All the info on the site is pretty spot on.
Timing: if you're on a holiday then don't rush, siestas are almost a must during the summer as the valleys get really hot.
Bike: ride what you have if you don't have a choice. If choosing between gravel and MTB then consider that there are plenty of tarmac sections, but also some rocky climbs/descents. We never had to hike, apart from an ambitious detour which is not on the official route (basically don't try to one up the official route:)).
Sleeping: as always, stay out of sight and you will be ok.
Thanks for your feedback...for me I'm trying to live life to the fullest without flying (which I've done my share of in the past).
Presume this is the route you did @yakut and @platypus? https://bikepacking.com/routes/bikepacking-slovenia/
Interested to hear what bike you rode on and how spot on the timings were?