/v/niggers seething about hurrdurr Kiara is sooo stupid because she didn't speedrun Portal like I totally did.
Her playthrough length is fairly consistent with the "average" time on
howlongtobeat.com (main story completion is recorded for around 8,5 / 9 hrs).
And you have to consider that even those times recorded on the website don't reflect the true average times of every casual normie gamer that ever played the game, as the users of the site (people motivated enough to record their playtimes in the first place) skew more towards the hardcore players. So her time doesn't look too bad. Sure, it's not exceptional, but it's also not "ohmaigawd she's super special retarded", it's just average.
And you have to take streamer brain / public performance effect into account, we know she's always primarily occupied and distracted by having to entertain chat.
