It's not the length of time, it's the down ballot obviousness.
Take two areas, congress district 1 and 2.
Area 1 is stuffing the box for Joe, area 2 isn't.
If area 1 has joe +others, then there are 50k votes for the Congress critter in 1, but in district 2, there's a normal amount. This is a YUGE red flag.
It's not the length of time, it's the down ballot obviousness.
Take two areas, congress district 1 and 2.
Area 1 is stuffing the box for Joe, area 2 isn't.
If area 1 has joe +others, then there are 50k votes for the Congress critter in 1, but in district 2, there's a normal amount. This is a YUGE red flag.
It’s is only done in the blue counties where they don’t need the extra votes for the congressional candidates. That’s why it’s ok to just check Biden.