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..
based on history, it could be months or years before the bull market resumes. it's also possible that the bull supercycle is over and that we won't see a resurgence like 2017 again.
bitcoin has only existed since 2009---anyone who gives you a specific answer doesn't understand statistics. it could look like the 2014-15 bear market. it could be much shorter. it could be much longer. for all we know, we're about to enter a 10-year bear market.

i always laugh when people say "there's no way it could be like 2014! cuz mt gox! blah bah blah!" they couldn't begin to prove what they're saying.