What is the ideal centrifugation time and rpm?

Excuse me, could you please elaborate on what factors would typically influence the determination of the ideal centrifugation time and rpm? Is there a specific formula or rule of thumb that researchers follow, or does it vary depending on the type of sample and the desired outcome? Additionally, could you discuss the potential consequences of using too high or too low of an rpm, and how that might impact the overall quality and purity of the separated components? Thank you for your time and consideration.