You have to repeat that process a few times. Create an uncompressed or lossless compression AVI and re-enter on a new timeline and repeat speed change.
hmm sound intresting FrigidNDEditing , but can you tell me a little about it or maybe give me a link that I can read about it, I have Vegas Movie Studio Platinum 9.0 and I'm a little new to this program.
don't know that nesting works in the studio version, this is the pro forum so I assumed Vegas Pro 9. (not that your posts aren't welcome here, just need to know that you're not using Vegas Pro)
Regarding rendering time, I'd assume somewhat faster than rendering it X number of times :)