Should I seek council from a separation review board?

So, In the past 5 months I have been getting into a decent bit of trouble on this deployment ( all of the trouble I have gotten into leading to the chapter has been from this deployment). I was a 35M Humint (I know not a super high speed MOS but still) It started with an IA Violation on my work laptop (CDV) which was just a mistake, but ended up with a field grade AR 15. and a demotion to E4. I was sent to work with MPs since my clearance was suspended and the boss didnt want me back. A couple months passed when my 1SG and CO brought me to their office to inform me that I could no longer work in my job and was therefore going ot be separated. I was honestly distraught and thats about the time when I said "**** it" and started goofing up badly. I was doing nothing everyday but pulling tower / ECP Guard, which is a demotion in itself. I started not showing up for guard mount a few times, people had to come find me. Leaving place of duty, as well as telling one of the NCOs with the MPs to go **** himself. Well It eventually led to a company grade article 15 and demotion to E3, whoich was when my commander told me he was recommending me for a chapter 14 12b for "Patterns of Misconduct" To be honest, at this point all I really want is to be out of the Army, The quicker the better, but I dont want less than a "General, under honorable conditions" Discharge, dont really want an OTH. My Commander did recommend me for a General, but I know that If i dont go to the Board that the person who reviews my packet is a General and without a boards suggestion, he can do whatever he wants. However, whatever a Separation Board says, the General can not go lower than that. My real question is how LONG does separation Board Normally take?? I want out but I want to be out on best terms possible.