Half an hour, assuming it’s the only shows you’re trying to keep up with. Most people have several shows on the go. For me, the choice becomes one between Marvel and everything else (though usually I can keep up with both Star Wars and Marvel, if that’s all I watch).
Yeah, that’s the big issue with Marvel’s constant deluge of content for me. When it was just 2 or 3 movies a year, doing a big binge to catch up with the latest installment was pretty easy. But now, with them releasing 4 movies and 4 streaming miniseries every single year, it’s pretty much become a choice between “binge the latest Marvel” or “watch something actually good”. I stopped watching Marvel stuff after the Infinity Saga was over, but now it’s almost impossible to catch up.