Well, it's around 20-30 hours of gameplay. On my first file I have 24:45 hours. I still have to gain some Super Flags, so that´s why I said 20-30.
There´s around 73 enemies, counting the bosses. Other PM games had at least over 100 enemies.
Sticker Star isn´t bad, but it´s not perfect either, and Super Paper Mario didn´t ruin anything just because it is a platformer. Both games ARE enjoyable.
And yea, sometimes I look at the avatar and I sometimes forget what I was gonna do. :I