@MortenSI I couldn’t agree more about the sweetest reward. It seems that we both understand the beauty of that moment. 
And yes, I’d say that anyone who is healthy and generally fit could reach the top of Osoršćica. I’ll add more details in case someone needs the exact locations…
@KatyaL : First, there are two key toponyms you need to know: Nerezine and Osor. These are the two villages where you can start your ascent. Both of them are located on the same road, both of them have bus connections to the towns of Cres and Mali Lošinj, so the access to them shouldn’t be a problem.
The ascent from Nerezine:
- shorter, steeper and more attractive
- time needed to the ridge (to St. Nicholas’ Chapel / Sv. Mikula): about 90 minutes (depending on how much you’ll rest on your way, of course)
- extra time needed to the top of the mountain (Televrina, 588 meters): about 45 minutes
The altitude of St. Nicholas’ Chapel is 557 meters, so it’s needless to say that once you reach the chapel, the rest of your trail will be a pleasant walk.
- From the top, you can also continue along the trail all the way to Osor. The time needed for this section is about 90-100 minutes.
Once you are in Osor, after 4 hours of hiking, I bet your legs will be thankful for the refreshment in the Adriatic Sea! 
This was exactly what I did, and what I would recommend (starting in Nerezine and then going all the way down to Osor). Yes, this trail is steeper for the ascent, but I believe it’s always more comfortable (and safer) to go up a steep section than to go down and watch your every step, especially if it’s slippery.
In my experience, there were also more climbers on the Nerezine section of the trail. Interestingly, the great majority of them were from Slovenia (where hiking is a matter of lifestyle). 
The ascent from Osor:
- time needed to the top (Televrina, 588 m): about 2.5 - 3 hours (depending on how much you’ll rest on your way, of course)
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extra time needed to St. Nicholas’ Chapel: about 45 minutes
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From the chapel, you can also continue on the section going down to Nerezine. The time needed for this section is about 45 minutes.
Possible detour (from both directions): Sv. Gaudent mountain hut (30 minutes, elevation: 274 m)
The hut is open daily from April to September, whereas October through March it’s open only on weekends. The hut offers cooked meals, but you can also bring your own food.
If you skip the mountain hut, you can also have lunch in the restaurants in Osor and Nerezine.
General tips and tricks:
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Make sure you wear comfortable hiking shoes, as the path is rugged and rocky.
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Don’t forget to take a lot of water.
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Start your ascent early in the morning, especially if you go hiking on a summer day. In July and August morning temperatures can be as high as 20-25°C, so you would want to reach the ridge before it gets too hot. Keep in mind that the most of the trail is exposed to the sun.
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In the period from June to September, pack your swimsuit as well, so that you can have a dip in the sea once your tour is done!
Have a safe hike!