How much piano practice to be able to play like this?

Is it more difficult to learn on a 88 note weighted keyboard than a 61 note semi-weighted keyboard? I've noticed most synths only come with 61 note keyboards, is this because synths require different styles of play>?
 
Ok so seen as I've not really had any real experience playing piano am I better starting on 61 key? Before I go out and buy a controller keyboard?

Awesome youtube vids as well :-)
 
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