About 45 minutes, as I recall, in Grand Rapids, Michigan. I think that was the year that marriage equality (e.g., gay marriage) was on the ballot in Michigan. (I just looked it up; it was a vote to amend the state constitution to ban civil unions and marriage equality.) That was in 2004. Since then, I don’t remember ever having to wait more than 10 minutes when voting in person.
If I remember correctly, Republicans in Georgia have consolidated voting locations in Atlanta–which is heavily Democratic–despite there being long line and hours of waiting in 2020. Is it intentional? 100%. In the rural parts of Georgia–and I’m pretty rural–you’re in and out in only slightly longer than it takes to read the ballot.