I absolutely don't know what to think about the jury taking this long. Sounds as if there may be a hold out or maybe more than one. I would be one absolutely refusing to find MM guilty with the evidence (or lack of) presented. I would not cave.
The longer a jury stays together and even shares meals together, the more they bond. (no pun intended on the word 'bond') I hope the defense attorney on the jury incessantly points out that the only so-called evidence the prosecution has offered is the word of RB, and that is worth even less than nothing. I believe RB to be the real murderer.
Lastly, I have to say that I think the jury instructions are playing a hand in this deliberation. They are confusing.
JMO