How to search titles with missing running time?

@Bethanny​, exactly. I found this one here on sprinklr:

https://www.imdb.com/search/title/?title_type=feature&num_votes=5,&genres=%21action,%21adventure,%21animation,%21biography,%21comedy,%21crime,%21documentary,%21drama,%21family,%21fantasy,%21film-noir,%21game-show,%21history,%21horror,%21music,%21musical,%21mystery,%21news,%21reality-tv,%21romance,%21sci-fi,%21sport,%21talk-show,%21thriller,%21war,%21western

The link above searches all feature films (number of ratings at least 5) without genre, and this link:

https://www.imdb.com/search/title/?title_type=feature&has=%21plot

all feature films without a plot, this link can be found on Google "feature films without a plot IMDb", but I can't find link for searching feature films that are missing the running time.

@plur62​ I don't think that is an option at the moment, this answer's feature might help.
Of course if there is any user who knows a better way they are welcome to post it here.

Cheers!