There is a limitation on debate, which is unlike other bills, for 20 hours, but there is no limitation on amendments. In other words, Republicans if they wanted to, and I suspect they do, could offer literally thousands of amendments and keep Senate in session for weeks and months.
Fox & Friends Saturday, Fox News, 27 February 2010, quoted in "Santorum's health care stall tactic: "Offer literally thousands of amendments" to keep Senate in session for months", Media Matters for America, 27 February 2010