Replying to 15.4 Gigs of HD, Help?

In Sony Vegas I exported a video in .mov, its 2 and a half minutes long coming out of windows movie maker, which the file is 34.2 Megs, in Vegas I added titles and it took an hour to render and in the end its 15.4 gigs, is this normal? Any body have a similar situation, I really dont wanna go through another hour of rendering just to have the same thing, and as always i give karma.

Notes:
Made a video in Windows Movie Maker 1280 x 720 shot with D5000
It exported as 34 megs
Brought it into Vegas 7.0 for titles only
Came out as 15.4 gigs