Yeah, that sounds pretty reasonable. And you'll definitely want to play this game twice because the first time through, you won't beat it in a very short period of time. The next few times through, you'll be able to beat Metroid Prime in under 5 hours (or whatever the magic time is) and then you'll see Samus Aran in her underwear.
I know that's very important to some of you gamers.
Note: Everything above is a prediction only