Add anime or manga before or after completed?

For manga I update whatever I read before reading everything I plan to read in that sitting so that I can read all of it at once without interruptions. For anime I update each episode individually because I watch much slower than I read manga, unless I know I'm going to marathon something.

For anime I update individually.
For manga, I read till I get tired then update.

I try to add as soon as I read some manga chapter, otherwise I end up forgetting about it. That said, I fail with it anyways, having too many manga that I don't even remember the titles of, so I can't add them.

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.

I almost always update as soon as I finish a chapter/episode, or else I'm likely to get lose track.

First i add manga/anime on my ptw/ptr list, when i'm going to start a series i put it in "watching" status and i update my progress every 3-4 episodes usually.

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.

I'll update anime one by one unless I'm binging, then I'll just wait until I'm tired of watching to update.