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 CorkerBob CorkerGOP senator: I'm ready to work with Trump, Dems on healthcare Senators introduce new Iran sanctions Senators war over Wall Street during hearing for Trump's SEC pick MORE (R-Tenn.) roughly agreed with that on Monday, putting the debt at $15.918 trillion. Rep. Bill FloresBill FloresTrump warns Republicans ahead of healthcare vote The Hill's Whip List: 36 GOP no votes on ObamaCare repeal plan Conservative chairman faces blowback over ObamaCare statement 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.