Personally. I'd only worry about the runtime for these type of films if it was well below 2 hours. Best case in point - X-Men: The Last Stand. 100
Mins long to tell a cute storyline AND Phoenix???!!! No way, especially as X2 was over 2 hours (X1 was short too, but Singer had no time, money or studio interest, which obviously changed).
I still remember HP fans complaining endlessly about OOTPs short runtime (2hours 10 mins), with the biggest book too. It was still one of the best and clearest films and adaptations in the series.
We all want more, I get it. I'd just rather have enough to keep me engaged, rather than overstuff a film with material that has ZERO relevance to the story, but just seems cool, or fans want it.