If the bull market recur periodically, like what happened in late 2017, how long dose a cycle would take? It seems at least longer than a year now..
As others stated there is not enough data we have yet for predicting the cycle of crypt currencies but actually the bull run after 2013 is at 2018 which almost going throughout this year but it will be expected to soon before the time taken of bear run so we may hope for a better run at the beginning or at first quarter of 2019.