Is the pattern 30 different fabrics? Or are several of them repeated?
Are you working from stash or buying fabric?
If it is 30 different fabrics you would need to check whether the pieces you are needing to cut could be done out of 9" x WOF or if you need the 18"x22" shape.
If fabrics are repeated 3 or 4 times, then 1/2 yard of each would work.
If working from stash, once again you would need to check the sizes of the pieces you are cutting to determine if the fabrics you have on hand will work.