According to the non-answer I got when I questioned my US Senator, apparently forever. My solution?
I bought a 'call blocker'. Search with Google, and you'll find one that is suitable to truly handle this constant badgering by phone that the government passes laws to stop, and then does nothing to do so.
When call answered - there is no response. when you call the number back they say that they are a marketing firm and if you want to be placed on their do not call list to press 1. i didn't call from the phone number that they called so, that's not going to work.
Spam call, claiming to be a credit account(nicely vague) about interest rates.
If you can avoid it, you should never answer these types of calls, and certainly never input any voice/data information, as you can see from Dom DiPaolo, their FIRST menu option is to press 1 to be placed on their do not call list, these types of numbers are outside the law, they don't care about the DNC or fines, all they're looking for is to build a list of numbers with verified human input to be worked at a later date.
How much sense does it make for any reputable business to have "press 1 to be placed on do not call list"
The more you press one, or talk to them, or call them back, the more your number will be flagged as "workable" (NOT "WORKING" BUT "WORKABLE" E.G. TO BE WORKED) and the more spam calls you will receive.
It is best to have only one number for incoming calls, and to screen all incoming calls. If you do not know the number, do not answer it but instead google it.