Hi Ms. Tiffany: Don't stress too much over the 5-month length - that's pretty typical. And it often translates into one treatment every 3 weeks or so... so the number of treatments is probably in single figures, even though 5 months seems like a long time when you're standing at the starting line.
Here's a good piece on clinical trials, and whether they're right for you:
http://www.healthcentral.com/breast-cancer/c/78/12290/cancer-trials/
Good luck!!! - PJH