You won't. Really.
Not because of just the time required but, if - and it's a big if I know- I've done my job correctly you won't be able to see everything. Because you won't want to.
I don't mean like Sarah's good/bad path. That's an easy one to decide to replay.
I'm talking about choices that will be underpinned by who you are as a person. Even role playing the role, I want to challenge your heart and mind on some fundamental questions on love, existence and life driven in part by your relationships with the characters that you have formed.
Some paths you will not see because you will reject them out of hand. And not just because it's not your cannon route. But because if, as a writer, I've discharged my duties correctly you simply will not be able to choose them.
Oh. And we have sex too. Mustn't forget that! And silliness of course. But also *points up* that.