at the rate of 10 million daily,how long would it take to pay off 17 trillion dollars?

17 trillion divided by 10 million days

I assume from your question, you are looking at the National Debt of the United States....which now stands at 18.4 TRILLION dollars.    INTEREST on this debt is approximately 250 BILLION each year.    WIth interest thrown into the equation , the payment period @ only 10 million DAILY  (only 3.65 BILLION Annually)   becomes  'NEVER'

Silly question maybe, but exactly who (or what) are the US in debt to the tune of 17 trillion dollars to ?

A simple Google search of who owns our debt as a result of unbridled U.S. government deficit spending:

https://www.nationalpriorities.org/campaigns/us-federal-debt-who/