It depends entirely on the contract. Some programs can start candidates within a few days, pending background checks. Some can take months if associated with EOD requirements, but that's very rare..
Estimated 5 days
Answered - Senior Acquisition Analyst (Former Employee) - Huntsville, AL
About 3 months for BG check
Answered - Fulfillment Operator III (Former Employee) - Memphis, TN
A week after you pass a background check.
Answered - Contractor (Former Employee) - Fairfax, VA
2 months due to background check, drug screenings, and government security clearance
Answered - Customer Support Specialist III (Current Employee) - Memphis, TN