Kingsglaive does not equal FFXV (most people who played the game didn't watch it). Plus her appearance, voice, and behavior is quite disconnected in that film from the game - it's almost like a different character.
Kingsglaive is canon to XV, downplay it all you want, I really don't care, it is canon and it counts as screentime for her in regards to the overall story, and despite everyone in Kingsglaive looking different to how they look in the game besides Regis, what you just said is a complete non argument that is irrelevant to anything you are actually trying to say, who Luna is and what she's doing in KG falls completely in line with what she's doing and how she acts in XV, she isn't afraid of death and puts herself into dangerous situations in both, the game mentions she was in Insomnia while her Oracle duties were put on hold, and the movie shows what she did in Insomnia during that time, her backstory with Noct is literally identical and reflected in every canon piece of XV that pertains to their childhood. Trying to say "b-but she looks different" is such a non argument that has no relevance to the concept of actual screentime, it's a non-sequitur.
Taking away childhood flashbacks,
Why would you do that when it's both important story screentime and important exposition? They all add up in the grand scheme of things, you're really trying too hard to downplay her involvement like this.
she appears at the start to meet Gentiana and the dogs
Which counts as screentime, which is the first time we see her alive after it was announced she is dead on the news, which both informs the player that she isn't dead, while also showing that she has the Ring of the Lucii, which is important for multiple reasons.
then she has a missable scene when Noct listens to the radio
I'm not sure why people keep saying this is missable, it happened automatically when I played it and in every playthrough I've seen I havn't seen anyone miss it either, it happens automatically after the dialog on the radio ends which happens automatically as soon as you wake up after sleeping at the gas station with Ardyn, not only that but the radio report itself is expository dialogue regarding Luna's past and the scene then shows her perform her Oracle duties, which is important to get a sense of her character moreso.
we see her looking at her wedding dress
This scene happens in Chapter 12 after the 1st Ravus flashback, in Chapter 7 you see Luna with Umbra in Altissia showing that she has made it to Altissia.
then she has the talk with Hillary, then the speech in Altissia (5min?)
Which are both important scene's no matter how much you try to downplay it.
then the flashbacks with Ravus and with the field and Gentiana
and lastly the ending of her with Noct
So all in all her screentime amasses to around 40 minutes for just base XV, like I said, which for some reason you can't seem to deal with that fact and had to try and ignore entire scene's just to come to the number of it being 35 minutes of screentime, like, what? You aren't even proving anything in your favour by doing that?
Did you even read a single thing I said earlier about screentime? Do you think that screentime alone is what makes a character important or not? Like I said earlier Darth Vader only has 9 minutes of screentime in Star Wars episode IV, his debut appearance, and only 15 in Episode V and 15 in Episode VI, that is accumulated from various small scenes of 1 minute or less here and there through the movie, like what is your point exactly? Do you even know what it is you're trying to argue regarding screentime? Did you know Thanos only has 12 minutes of screentime in Endgame? Do you even know anything about story writing? You know a character can have literally 0 screentime and still be a super important and major character?
But lets not forget she has no independent scenes
LMAO what? So what? Who cares? Why would that matter towards anything? What are you even trying to say? So screentime now only matters if it is just the one character and no one else? What kind of goalpost moving is this?
Cut away at least 7-10 minutes of the other characters speaking in those scenes and you get what 28minutes?
LMAO "i-if you remove all context from the scenes and anyone she interacts with and only count her spoken lines then it's even less screentime!?", this absolute desperate reach is hilarious and one of the best examples of a non argument I've ever seen you make.
28/420 = 6.67% This is only proportionate to the cutscenes in the game
Remind me to never let you do math ever again, especially when your entire basis is using faulty numbers that have no merit to any argument that could possibly support you. Not only are you basing things on arbitrary things like how long someones movie version on Youtube is, which differs from 3 hours to 7 hours, you are also trying to use how long to beat which includes things outside of cutscenes into the play time count and doesn't take into account things such as cutscene skipping.
I know these are rough estimates
Try completely wrong on all accounts?