..games are as long as you make them really..
Lylat Wars isn't exactly long.. but I think I have completed that more than any other game because I played through it so many times.. it is so good..
I'm hoping Excite Truck is kinda like Wave Race or 1080, neither of which are really long or appear to have many courses, but I have played those games so much, with 1080 Snowboarding and Wave Race: Blue Storm being two of my favourite games ever. I just got so much enjoyment out of playing them that I loved playing over and over, trying to better my scores and times. I feel this could be the case with Excite Truck too, but we'll just have to wait and see. I'm quite looking forward to it though!