An informal survey of Republican debt clocks — those constantly running tallies of the depth of U.S. government debt — shows that many of them are running fast.

While most clocks are known to be rough estimates and extrapolations of the pace of federal debt, some are off by as much as $200 billion, and few seem to agree with each other.

As of Friday, the Treasury Department's official website that tracks the sale of government securities held the public debt at $15.915 trillion. Sen. Bob CorkerRobert (Bob) Phillips CorkerOn The Money — Sponsored by Prudential — Senators hammers Ross on Trump tariffs | EU levies tariffs on US goods | Senate rejects Trump plan to claw back spending Senators hammer Ross over Trump tariffs GOP senator demands details on 'damaging' tariffs MORE (R-Tenn.) roughly agreed with that on Monday, putting the debt at $15.918 trillion. Rep. Bill FloresWilliam (Bill) Hose FloresHouse GOP leaders push immigration vote to next week Trump vows to stand with House GOP '1,000 percent' on immigration GOP revolts multiply against retiring Ryan MORE (R-Texas) was also close, estimating it to be $15.927 trillion.

Rep. Ben Quayle (R-Ariz.) low-balled the debt on Monday, putting it at $15.438 trillion. But many other GOP estimates were higher. Also on Monday, the Republican Party of Milwaukee County in Wisconsin and listed the debt at a slightly higher $15.942 trillion., an apparently nonpartisan site that estimates the debt, put total U.S. national debt at $15.967 trillion on Monday. Rep. Mike Rogers (R-Mich.) agreed with that assessment.

But Republicans on the Senate Budget Committee said it was $15.994 trillion on Monday, while Rep. Michael McCaul (R-Texas) said it was $16.047 trillion.

Meanwhile, the Senate Republican Conference said it was $16.134 trillion, and the Washington County Republican Party in Nebraska said it was $16.315 trillion.