Well, for a bit there I was beginning to think I was alone on this and was starting to feel like an impatient old fart. XD Glad they're ended up being a few people who do feel similarly.
Again, don't get me wrong, if they're good enough I'll take a longer story and have watched/read and appreciated my share of longer ones, I just feel like the shorter/medium length stories tend to leave more an impact with me than ones that are very long or have sequel after sequel. Not only do I also sometimes tend to forget details if it goes on forever, but I also start to care less, even about the characters I originally had some concern for.
It's like...being a person who sits around a campfire while someone tells me a story. If it's a longer story he's telling, I'm willing to stop and come back a few times if I know the storyteller's obviously building up towards a big conclusion, but there still has to be a certain....formula here to keep me interested and also for me to remember everything or to continue caring about the protagonists. If the story just seem to be dragging or is full of details or subplots I don't really need that much, I ain't coming back to that campfire. XD Give me a one-two punch, not several martial arts lessons. (<-- Lamest thing I've ever typed.)
To me, I like one, solid tale I can continue to think about and interpret my own way, one that I can revisit again and again instead having to kill myself trying to revisit an insanely long story that I may have only liked for certain parts of and can only recollect certain details about. (Again, there are sometimes exceptions here. I don't avoid every old story-based TV show I used to love because it was long, for example.)
I believe you can get to the point relatively quickly while still managing to make me care about the characters.
Webcomics are different because they are usually put out a much slower pace - it's only natural they take a long time to get through or are even never completed (plus more creator freedom, so it's typical for reboots or new projects to be started out of nowhere), but even webcomics can drag unnecessarily, and many do/have.
One problem with webcomics is it's hard for a creator to let their story end, if they've grown a love for their characters/world/ect., they can't bear the idea of not working with them, so even if they have an ending in mind they put it SO far down the line of the story that it becomes that much harder to reach. Even I did this with a past comic of mine, to the point that I ended up disliking the characters to an extent, when originally I couldn't bear the idea of no longer working with them. XD So yes, beware of clinging too hard to your beloved characters/concepts.