re: The Justice Department won’t have January 6 evidence ready until 2022.

According to Title I of the Speedy Trial Act of 1974 (revised/amended 1979), trial should generally begin within 100 days of arrest. (See below) And yes, this is FEDERAL LAW.

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Title I of the Speedy Trial Act of 1974, 88 Stat. 2080, as amended August 2, 1979, 93 Stat. 328, is set forth in 18 U.S.C. §§ 3161-3174. The Act establishes time limits for completing the various stages of a federal criminal prosecution. The information or indictment must be filed within 30 days from the date of arrest or service of the summons. 18 U.S.C. § 3161(b). Trial must commence within 70 days from the date the information or indictment was filed, or from the date the defendant appears before an officer of the court in which the charge is pending, whichever is later. 18 U.S.C. § 3161(c)(1).

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If the constitutional guarantee of a speedy trial is determined to have been infringed, charges must be dropped or, in the event of a guilty verdict, that verdict must be overturned.

See link: Criminal Resource Manual: 628 Speedy Trial Act 1974