How many days, on average, are needed to count all votes?

Here's the story on Georgia's military absentees. It's not that 8000+ WILL arrive tomorrow, it's that 8000+ were requested but have not been received yet (and not everyone who requests one actually uses it):

I think there's some confusion, at least in my replies, over military/overseas vote in GA.
Most of these votes are already counted. However, they can still arrive until tmro; 9k were sent out but weren't returned. These late arriving ballots are what's potentially left

— Nate Cohn (@Nate_Cohn) November 6, 2020

It really depends on the situation...

Generally when a state is "called" it is not when the votes have been all counted, it's when there are enough of the votes to "know" with fair certainty who will win.

For instance, California was called before 50% of the ballots were even in, because we know the demographics and patterns. Texas was called though there is 10% of the vote remaining, because Biden would have to win about 90% of them which seems impossible. On the other hand, Arizona is 90% done, but it's close enough that most news sources have not called it.

The last state to be called last election was Alaska, which was called officially I believe at 11:58 PM on Thursday. So, two hours from where we are now. But, Alaska is heavily republican, and the race was not close enough for it to matter. 

Generally we know the winner before all the votes are counted. For instance, Mitt Romney conceded at just about 2:00 AM on Wednesday morning, but not every state was called. Hillary Clinton conceded on Wednesday just before midnight. Not all the votes were in yet, but enough that Clinton clearly lost. Clinton's lead diminished after election night, yet she never asked for vote counting to be stopped. 

So, we're now at a day longer than it took for Trump's win to be official. The race could be called within the next 6 hours or so, either if Pennsylvania is called, or if Georgia is called along with Arizona or Nevada (don't think either will be called tonight).

Meaning we're something like a day behind "schedule". This is in the midst of a pandemic, where a lot of people logically decided to vote by mail (I wish 100% of people had chosen to do so).  I don't think taking a day or two longer is problematic, especially in these circumstances. If it's such a big problem, the solution is to process mail in ballots a few days early, which republicans fought against. 

I guess...

Is just that I'm used to my country election when most zones close at 5 PM and by 8 PM we already know who is the president, so even 24 hours waiting sounds quite a big deal for me

I believe in Brazil the Presidential election is simply a majority vote? If we did that in the US, we could have called this thing a while ago. 

And tbh, we've known since early on Wednesday when they called Wisconsin that Biden would win. News organizations are being abundantly cautious, as they should, but realistically it's over, and it has been for a while.

 Yes, but it would change much a thing it was "the winner takes it all" system. What happens here is how fast the votes are counted, at 9 PM only one state does not have winner yet, which is Acre and only because their timezone is 1 one delayed from the rest of the country 

What is sad about choosing the lesser evil?

Trump has destroyed and killed a lot of things in these past years. Doesn't seem delusional to think he's gonna continue. And he isn't even the biggest problem. The whole Republican party is complicit in his doings, so it's not just Trump people are angry about. Trump would be an absolute non-issue if the GOP had any kind of spine.

I'd say pick the greater evil because good is dumb! =P

Anyway, congrats to the first rap star President.

It's pathetic how long it takes for the results to come in. In Brazil everyone knows who the next president is by the end of the day. It's also much safer since it's almost impossible to destroy a vote there, it's not tied to a destructible piece of paper.

It's also an incredibly undemocratic voting system for a country that loves to consider itself the bastion of democracy.

Why is it undemocratic? I'd love official results, but I don't see how taking a few days renders the process "undemocratic" assuming all votes are counted properly. Dunno enough about Brazil's elections to know if they do it better, but I don't see anything inherently wrong with this, aside from impatience.