2 years?
Seems bit harsh.
Some people only vote in what they deem important elections namely often presidential elections every 4 years.
Then may not vote in given election if say well not close race, inconvenient have to pick kids up from football practice, cheerleading after work , I got sick and had to go to doctor etc.
May not vote in midterm election for representative and say senator not running in my state this time.
Might not vote in local race. I didn't vote in primary county offices because I didn't know candidates and well so I shouldn't. By fall I plan to.
Two full election cycles is eight years.