Counting for days is not OK. To ensure fair counting you need to have poll watchers from all interested parties present during voting and counting, and it is difficult to be present over 96 hours period - people need to sleep, and they can't observe the ballots repository or counting while they sleep.
There is no reason why all ballots can't be counted it a few hours. If more people are needed to do it, then so be it.
There is no reason why all ballots can't be counted it a few hours. If more people are needed to do it, then so be it.