The Dems slept on Jan 6 for eighteen months, now they're dragging it all up for election time. Are you voting Dem?

Actually, if you look at the details, you'll see months and months of Republican foot dragging and delaying tactics.

People in Congress originally proposed a joint House & Senate committee to investigate Jan 6, but Senate republicans blocked it with filibusters.

So the House went ahead; the Jan 6 House committee was formed on July 1, 2021. Trump and his associates continued their delaying tactics.

For example, when the committee was subpoenaing documents from Trump and his associates. Trump used every delaying tactic in the book, bringing cases thru multiple courts all the way up to SCOTUS before eventually turning over the documents.
https://rollcall.com/2022/01/19/supreme-court-allows-release-of-trumps-jan-6-documents-to-congress/

So it wasn't until Jan 20, 2022 that the committee finally got access to the Trump documents. All that delay was due to Trump and republicans.