How long would door slamming take to affect the regular functioning of the vehicle in any way, and are there any ways to find how many door slams a door for a particular individual make/model can take (e.g. via manufacturer testing reports) before there is damage (to the door or elsewhere)?
Vehicles differ in the minimum force required to close their doors. Someone who drives a heavier vehicle may be more prone to assuming the same amount of force required to close a lighter vehicle's door, which could result in accidentally slamming it.
Specific example: a Suzuki Ventura requires a certain amount1 of force to close its door normally, but when the same amount of force is applied to the door of a lighter Toyota Corolla, it results in a noticeable 'slam'.
Drivers can ask passengers to close the door lightly, but that won't always be carried out as hoped.
What I know so far
Some aspects of cars are put through very rigorous testing, but I'm not sure if the doors are included in that testing, nor if those test results are publicly available?
Some googling shows anecdotal stories (from reddit etc). For example:
It's still very hard to gauge how often this occurs, and these anecdotes could turn out very differently for different make/model.
1If this can be measured/quantified, please let me know how that's done and I'll include it