How long will AMC Entertainment (AMC) and Blackberry (BB)continue with the bull run in the next few few days or weeks?

It's all about naked shorts and gamma squeeze.

https://en.wikipedia.org/wiki/Naked_short_selling

https://en.wikipedia.org/wiki/Short_squeeze#Gam...

Most of the shares of AMC are held by retailers/investors yet the amount of shares shorted exceeded the float. So invest only if you want to teach these corrupted hedge funds practicing naked short selling a lesson and willing to diamond hands and lose money for the cause.​​​

Nobody know for sure when any stock will end its run. It is pure speculation. When you make big money, you would think you are genius and will bet more on the next hot stock. When the tide turns, you would pump in more money hoping for rebound. Some times it recovers, some times doesn't. One of these days things are going to blow up and almost certainly end up suffering big loss. Greed and fear are the 2 deadliest human emotions that will wipe out your trading account.