https://en.wikipedia.org/wiki/Cloture#United_States

After cloture has been invoked, the following restrictions apply:

No more than 30 additional hours of debate may occur on the bill in question[36] (though this additional time is commonly shortened or vitiated altogether).

No Senator may speak for more than one hour.

No amendments may be moved unless they were filed on the day between the presentation of the petition and the actual cloture vote.

All amendments must be relevant to the debate.

Certain procedural motions are not permissible.[which?]

The presiding officer gains additional powers in controlling debate such as the power to count to determine whether a quorum is present and to rule amendments, motions, and other actions out of order on the grounds that they are dilatory.

No other matters may be considered until the question upon which cloture was invoked is resolved.