Yes, that's right
Then the length of your repayment period will depend on the amount of your total education loan indebtedness. This total education loan debt includes the amount of your consolidation loan and your other student loan debt.
Can I  include other student loan debt in the determination of the repayment period for my Direct Consolidation Loan?
Yes, you can. Be sure to include those loans in your consolidation application in the section to list the loans that you do not want to consolidate, but that you want to consider in determining your repayment period.