The Milky Way galaxy is approximately 100,000 light-years long and 1,000 light-years deep (Wikipedia). edit: I'm not sure why I felt the need to write that.

Voyager was 70,000 light-years from home and it was said on the show they needed 70 years at warp 9 to get home so the velocity of warp 9 must be 1,000 light-years per year (365 earth days) plus the whole faster than light thing which disregards the usual light year in a year thing. That's 2.74 light years per day which seems low considering Warp 1 is supposedly equivalent to the speed of light.

We've been lied to all these years it's all fake man!