Question: There is a Jewish source that an hour was split into 1080 parts and there seems to be an explanation for that number that it is the amount of breaths taken in an hour (18 breaths per minute (which is realistic))

Is there any evidence that breath was used as a time measurement, before clocks became popular?

Answer: 
No
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The impeachment motion had made it through a House committee, although the actual impeachment had yet to be voted on by the full House of Representatives. The latter process, as well as Nixon's trial (and almost certain removal) in the Senate, was short-circuited by Nixon's resignation.

The purpose of impeachment and trial of an elected official is the removal from office of that official. Once Nixon resigned, the purpose had been accomplished, and there was no need to proceed further in Congress.

Of course, Nixon could have been tried in "judicial" courts until the Ford pardon made that moot.
**Question:**  

Did American leaders give any serious consideration to proceeding with Nixon's impeachment and trial after he resigned? 

The resignation made the impeachment superfluous. As outlined in the U.S. Constitution an impeachment in the house of representatives results in a trial in the US Senate with the end result to remove a President from office. The Constitution states beyond removing a public official (judge, president etc ) from office, no criminal penalty such as fine or imprisonment can be levied. So once Nixon left office tying up the legislature to formally do what has already been done didn't make any sense.

On the other hand work did continue on the impeachment in the Senate subcommittees. They were taken by the senate to review the rules of impeachment so while Nixon resigned August 8th 1974, the Senate Committee on Rules, continued to work until Sept when they formally delivered their report to the senate on how to modernize the rules last modified in 1868. 

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> \*\*[Senate Impeachment Role](https://www.senate.gov/artandhistory/history/common/briefing/Senate_Impeachment_Role.htm) \*\*  
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>  During the summer of 1974, in the wake of the Watergate scandal, the Senate prepared for the possibility of a second presidential impeachment trial, as the House of Representatives moved ever closer to impeaching President Richard Nixon. In July the Senate adopted a resolution directing the Senate Committee on Rules and Administration to review the existing impeachment rules and precedents and recommend revisions. The committee, aided by Senate parliamentarian Floyd Riddick , devoted long hours to the Senate’s constitutional role in impeachment proceedings. The committee was meeting on August 8, 1974, when President Nixon announced that he would resign. Despite this unprecedented event, the panel continued with its work under a mandate from the Senate to file a report by September 1. The report contained recommendations that were primarily technical changes in the rules that had been adopted in 1868 for the impeachment trial of Andrew Johnson. With the resignation of President Nixon, no further action was taken.
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