do you mean completed with one character in 2day, or like all characters in 2 days???
i thnk it matters how you play it, i do grinds here, half pipe there, more grinds etc. but ive seen some people play , yeah they get higher scores, but they just do one thing all the time, my mate gets higher scores, but all he does is get stuck in a bowl and do tricks over and over again, but as its in a corner he gets big combos, therfore making big scores, but i find that sooo boring, i find new stuff all the time, thats what i find soooo fun, doing the levels different each time, not doing the same lines over and over again