Should i buy Skyrim on my ps3?

I played it on the pc, but anyways, to answer your questions:

• Anywhere from 50 to about 200 hours would be my guess, depending on how much you get side-tracked.
• 10/10 - best game of the entire last gen
• personally, after about 85 hours of play time I started to get bored of it (I had already finished all the important story lines).
• The game gives you a lot of freedom and a lot of content for each type of character you decide to make. You'll find new things to do for hours on end.
• The inventory system is okay, nothing special but not complicated either. Just don't hoard, you have a (perfectly reasonable) weight limit.
• The graphics were great on the pc and mods made it better, can't say for the ps3. You could just look on youtube to see what the ps3 graphics are like.

Other points worth knowing? You should've played this back in 2011, it's an amazing game.

I have skyrim on ps3 and it play fine at the beginning of the game

I would say get fallout new vegas if you haven't played it instead of skyrim.

skyrim is a good game though but I didn't like the combat. fallout is way better.