Perhaps the (2) and (6) are not what we immediately perceive them to be (a count of actual years). When Q puts things in brackets or parenthesis, it opens up other possibilities. I have wondered if the 2 here = house and the 6 = the senate. Someone else may have a better take.

EDITED TO ADD THE FOLLOWING: The house was lost in 2018. The senate was lost in 2020. It appears both were required to bring about the current state of things. As a result, I a not looking to wait 6 years. At the point in time of the referenced Q post, the 2020 election was still in the future.

Perhaps the (2) and (6) are not what we immediately perceive them to be (a count of actual years). When Q puts things in brackets or parenthesis, it opens up other possibilities. I have wondered if the 2 here = house and the 6 = the senate. Someone else may have a better take.