Yeh it was more of a comment about how I've often seen these threads and realize that many players sit down and play guitar for multiple hours at a time. The realization that I'm the odd duck ha.
As in: I never practice guitar playing with that explicit purpose. If I were to say, learn a song (which is pretty rare for me) I would probably spend maybe 10-15 minutes doing that. Then possibly go back to later that night, next day, etc.
Writing songs would be a bit of a stop-start situation ... grabbing guitar, working it out, grabbing pen/paper, recording bits. Getting it down enough, then going back again later etc.
Recording sessions would be until I get the take. Could be 10 mins, could be 2 hrs. But it would involve lots of stops-starts.
Preparing for a live show- would run through the set (which would typically be 30-40 mins for the groups I've been in) 3-4 times over ... maybe a 3 hr session. For me, the singing part would be where I focus- usually the guitar playing is set to where I don't really think about it. Practicing the vocal projection is more challenging, especially live.
Then this bring us to- simply playing for the sake of picking up a guitar and playing. This is where I do this most days (sometimes skipping a day or two, occasionally a whole week or two if I'm not feeling it)- and these "sessions" would typically be just like reading a book or something- kind of sitting down, relaxing- running through my usual riffs or older songs, revisiting things, humming a melody, walking around the kitchen pretending I'm PF Sloan (yep) ... ha ... this is where I would say my usual is around 20-30 mins at a time.