Supposedly will be a 3 hour runtime

Should be longer.

that being said I will have to wear adult diapers or something like that lol

I am a bit confused about why this is such a big deal. While I understand this is a bit long for a Marvel film there are plenty of 3+hr films around and I have seen several at the cinema and I have never recalled for them this factor being discussed or being joked about. I mean there's nothing wrong with it I am just a bit confused. I think it also demeans Marvel films in some way, to me anyway it makes it seem like their films shouldn't be considered proper films. I will not be getting into that debate here, I myself am not a big fam of Marvel films but nevertheless a film is a film regardless of what you think the creative quality of it is.

edit: just to clarify I am not bashing the film nor the people discussing it or joking about it, just curios.

Running time is listed at 182 minutes.

Might should avoid popcorn and drink when eventually seeing this.