They are long. The longest of any Akrapovic muffler I found on their site.
When I bought my Akrapovic full system back in '08, I wanted titanium for durability, but I could only get the mufflers in carbon as they were a closeout special.
As I figured, the sleeves started to develop cracks and began getting "soft" after around 1.5 years.
I ordered a muffler repair kit which had the sleeves, packing, rivets, and labels.
Not cheap ($500/pair).
Since I knew it would be a wash, rinse, repeat situation, and the rebuild kits are nowhere to be found, I changed the game and ordered a pair of LBP titanium large oval mufflers from SimonKobe with 60mm O.D. inlets and same spring attachment locations.
Not only are the LBP mufflers much more durable, but they are lighter than the carbon mufflers.