In order to have the condition removed on my green card, is it necessary to spend a minimal amount of time in the US?

No, there is no such requirement, other than maintaining one’s permanent resident status. After the petition is filed, it will be necessary to undergo biometrics in the United States. It is important to ensure that you are within the legal boundaries of residency during and after your application process. Contact the EB-5 residency requirement lawyers of White & Associates at 818-730-3540 for information about the residency requirements.