If you get an early start, you should be able to do all colors in the same day.
This is if you are using all basecoat type paints.
Sometimes it's best to do the pinstripe first. Spray it, then mask it off. Then you can do the bottom color. Mask it off, then do the top color.
I've shot some pretty big flakes through my gun which is a 1.4. But keep in mind, the bigger flakes you get, you may need to sand and reclear the paint job.