It is impossible to predict exactly. But my idea is that this altcoin bubble could last for 3 more months. All of this depends on Bitcoin. As long as Bitcoin has a bull run, Altcoin will also have a bull run. So if you want you can follow the price chart of bitcoin.
The most shit coins are on the rising. I am not sure, how long this altcoin bubble run. You never knows but it's definite another future billionaire here. Bubble can vanish at any time, it's great idea take the profit out and happy what you get.