All of it more than 90% of the time. It’s rare that I don’t.
I just received a 5 CD set of George Szell’s Decca and Philips Recordings 1951-1969, Original Masters. I began and will listen to all 5 CD’s, all the way through. May not be all in one sitting, but won’t listen to anything else until I do.
I have tendency to do that.
Yesterday I finished the Solti Decca Edition Volume 6. 18 LP’s, straight through over multiple days.
And there are many others I do the same. Now, after I have listened to a set complete, I may not listen to the whole set all the time, but would never listen to a partial symphony when I go back to the set again, and typically listen to more than just one in the set. I am partial to box sets, and am more than happy to explore and enjoy them in their entirety more than once.