Webcomics typically adhere to the classic newspaper funny pages formats of a either a single frame, or a few panels laid out in sequence -- but that's not a hard rule. Online comics can have a limitless number of panels or just be comprised of one big "Infinite Canvas." xkcd creator Randall Munroe finished a single, massive story of the strip comprised of 3,099 panels, and Geekwagon put it all together in an easy to view slideshow/animation that's worth checking out.
Time follows an adventure of the two xkcd stick figures as they journey to understand everything -- which, like creating a 3,099-panel comic strip, is an ambitious task. The characters first build a sandcastle and use that creation as a springboard for learning about sea levels.
The story, world and art grow more complex as they go along. The Geekwagon compilation of Time is put together in a way that places it somewhere between animation and comic strip that's not quite a motion-comic. You can set it to play back at certain speeds and automatically pause on "special frames," which are usually the ones with words on them. It's more like watching a flip book than reading a cartoon, and like most of xkcd, it's really enjoyable.
You can read/watch/love Time on the Geekwagon site.