2.5 hours walk up.
Approx 1.5 hours at the top.
2 hours descent.
People will have differing opinions on how tough this walk up and down is. I'm English, fairly fit but I am not as used to hiking as mountain dwelling folk like the Swiss, Austrians etc.
There were a few Swiss in our group and they found the walk fairly easy. I didn't struggle, but you sweat A LOT so bring at least 2 litres of water, changes of t shirt (I used 3) and ensure you have proper walking boots. Also bring some food to boost your energy such as a banana, some sweets and even some electrolytes mixed into your water. Some may find this unnecessary but the staff at Stromboli understate this hike and downplay it somewhat in my opinion.
Now the warning is out of the way, I thoroughly recommend this trip. You get to the summit at sunset and if you are lucky will see and hear some eruptions. We heard several and saw 3 or 4 explosions and were even rained on by volcanic ash.
The walk down is predominately through volcanic ash which is just like sand. A little tough on the knees perhaps but all downhill - obviously.
It's a once in a lifetime opportunity to see the world's most monitored volcano.More