Communications Director, Senator Harry Reid
Some guidance on procedure today: under Senate Rule 22 (the cloture rule), at noon today the Senate will automatically begin a new legislative day. In practice, this means that the chair will briefly interrupt any senator who is speaking on the floor, the clerk will read a communication to the Senate, and the chair will lead the pledge of allegiance. Once that is done, the Senate will be in a new legislative day. If Senator Cruz remains on his feet, he will still have the floor.
One hour later, at approximately 1 pm today, the Senate will proceed to vote on cloture on the motion to proceed to the House CR (60 vote threshold). Since this timing is set by rule, this vote will occur regardless of who is speaking on the floor. If cloture is invoked, the Senate will proceed to up to 30 hours of debate followed by a vote on the motion to proceed (simple majority).
The 30 hours of post-cloture debate time is structured by rule. Senators are permitted to speak for up to 1 hour each. If Republican senators yield their hour to the Republican manager or Republican leader, the manager and leader may yield up to 3 hours to one senator. Any additional commitment of time would require unanimous consent.
Please keep in mind that this is all basic floor procedure that Senator Cruz has presumably been aware of since he asked to be penciled in for this talk-a-thon on Monday afternoon.