The 2025 altcoin season will be similar to 2017, with most altcoins rallying simultaneously, and will last for approximately 2-3 months, potentially even shorter.
"the upcoming altcoin season is likely to look much more like 2017 than 2021 simply because the amount of time that people have to pay attention to crypto is back to normal relative to the 2021 cycle. In 2017, the rotation was less obvious. All altcoins essentially rallied at the same time. And notably, the altcoin season lasted for only around 3 months and not 6 plus months like in 2020 and 2021. In fact, you could go as far as to argue that the altcoin season could be even shorter just because attention spans are much shorter than in 2017."