“We have lately made a rule to meet at ten and sit ’til four, which is punctually complied with” (David Brearley to William Paterson, 21 Aug. 1787, FARRAND description begins Max Farrand, ed. The Records of the Federal Convention of 1787. Rev. ed. 4 vols. New Haven, 1966. description ends , 3:73).
“[Diary entry: 21 August 1787],” Founders Online, National Archives, https://founders.archives.gov/documents/Washington/01-05-02-0002-0008-0021. [Original source: The Diaries of George Washington, vol. 5, 1 July 1786 – 31 December 1789, ed. Donald Jackson and Dorothy Twohig. Charlottesville: University Press of Virginia, 1979, p. 182.]