For some players completing Prey will present a challenge, for others that's not the challenge at all, instead the challenge is to find ways to beat it as fast as possible.
We'd estimate a normal playthrough would take anywhere from 10 to around 15 hours, but speedrunners are now beating it in less than 11 minutes. Youtuber Bjurnie published a video last night showcasing how he beat the game in 10:52, you can check it out here.
You could argue that part of the fun with a game like this is exploring it for shortcuts, but perhaps Arkane left a few too many for speedrunners to find.