Again, this bull run is very different from what we have seen previously, as the storyline of Bitcoin and Ethereum has change already since huge companies are investing on them.

So as long as retail and institutions are willing to put their money on those two then it is hard to say when this bull run will last. As per historical logs, there's supposedly a 4 year cycle in specially in bitcoin, but I'm not sure if that trend will continue as the narratives has made a U-turn this 2020-2021.