it takes as much or as little time as you have to spare, once you get past the video tutorials (which are in the create mode and at the very start of LBP to explain controls and stuff)
If you are creating stuff you do it all very much at your pace, and can pause it any time you feel like it, if you were playing online you'd probably want to pay full attention for the length of the game, if you were just playing on your own you could play through as fast or slow on a level as you'd like, the possible exception is if a level has a race portion, or some of the mini games that are created.
As I'm still learning about all the controls and possibilities in the creator mode the video tutorials mean I do need to pay attention there (that and I like listening to Stephen Fry's voice overs and comic bits), but that's it really, and also if you are in create mode and mess up as your attention gets pulled to something else, you just hit left on the digital pad and it rewinds the action so if you were in the middle of say bulding a bridge and made it live and saw the whole thing colapse you could rewind it back to the point it was before you let the action resume ...
That's probably a really bad description but yes, LBP would suit you well with the exceptions I listed before about online/mini-games/races
If you are creating stuff you do it all very much at your pace, and can pause it any time you feel like it, if you were playing online you'd probably want to pay full attention for the length of the game, if you were just playing on your own you could play through as fast or slow on a level as you'd like, the possible exception is if a level has a race portion, or some of the mini games that are created.
As I'm still learning about all the controls and possibilities in the creator mode the video tutorials mean I do need to pay attention there (that and I like listening to Stephen Fry's voice overs and comic bits), but that's it really, and also if you are in create mode and mess up as your attention gets pulled to something else, you just hit left on the digital pad and it rewinds the action so if you were in the middle of say bulding a bridge and made it live and saw the whole thing colapse you could rewind it back to the point it was before you let the action resume ...
That's probably a really bad description but yes, LBP would suit you well with the exceptions I listed before about online/mini-games/races