Staring at wall produces little information in and of itself, perhaps through reflection, but staring at a TV produces a load of information, most of which is useless like names of characters, their favorite dresses, what food is being eaten where, etc. You can learn a lot by just passively observing even "dumb" TV especially if it contains foreign content or skills like cooking or sports. Again, not saying all of it is relevant to your life, but that's a different issue.
TikTok I have no knowledge of, but for sure seeing something like "Arab dude wearing suspicious looking outfit playing unknown instrument that I now have a name for playing a tune I did not know the name of but I do now says weird cultural thing that is highly specific to his or her locale but it kind of makes sense because of clues inside the video" is still very high-load compared to "I see a bird there that I do not care about in any way shape or form but I do remember it is blue".
I'm aware of an association between perception of time to number of photons received in the eyes.
These relate to both how much time the events appear to take subjectively as well as how well remembered they are or how long they feel retrospectively. As in there is an actual physiological explanation for "time flies when you're having fun".
There probably is something to also be said for attention too. Increased awareness and attention will undoubtedly use up more 'bandwidth' or 'storage' too.