Basically, what I want to know is: How do you add to your list? Do you watch and read a bunch before adding everything you completed? Or do you take the time to in between watching or reading individually add chapters and episodes?
It really depends. I usually mark something as currently watching/reading, and then binge it. Manga is a bit more difficult to update on frequently because it's much easier to keep reading rather than to stop and update. Anime is usually a bit more flexible, sometimes I'll take a break from watching and end up here and I'll update at that point, sometimes I'll get through the whole series and mark it as completed afterwards.
If depends upon whether or not I'm on this site afterwards. Generally, when it comes to airing stuff or manga I'm following, it's one at a time, simply on account of there being a week or month in between update times. When it comes to backlog stuff, it's whatever amount since being here last, and I'm quite frequently on here, so it usually ends up being small chunks of media at a time.