The bar is offered the last week of July. I'm taking the NC bar, which is July 29th and 30th. The multistate (200 question multiple choice exam on 6 subjects) is offered on July 30th for everyone in the country. The multistate is always offered on the same day. I don't know what other requirements Ohio has. The first day of the NC bar exam is 12 essays based on NC state law and general common law principles which everyone studied in the first year.
While it might be short in time, the 2 months of bar prep seem to be the longest of my life so far. I've been at it for a little over a month now and can't wait for it to end. If you fail in July, my understanding is that you can take it in February in every state, but I could be wrong.
As far as lifestyle, it's like the first semester of 1L all over again. I'm putting in 3 hours of barbri class time, plus about 4-6 hours outside of class every day reviewing notes and doing practice questions. When July gets here and barbri ends, I'll probably be putting in about 10 hours per day up until the day of the exam.
If you can imagine a massive, comprehensive law school exams on all the subjects you hated in law school (civ pro, torts, property, etc.) being offered over a period of 2-3 days, that's what the bar is like.
With hard work and any luck at all, I'll be done with this exam and will never have to take it again.