Just to make sure we are referring to the same thing:https://www.bankofamerica.com/credit-ca ... it-card.go
I apologize, but I gave you bad information. I thought it was a 0% purchase APR, but now I see that is strictly a balance transfer APR, which you don't need. The 0% intro APR for the Cash Rewards card, by contrast, applies to both purchases and balance transfers. You don't want the "Bank Americard Credit Card" because they will start charging interest on purchases out of the gate. As far as I know, 15 months is as good as you'll be able to get right now.
And it does say "billing cycles," but effectively this is months. The statement cuts at the end of the billing cycle, and a new one starts the next day. You apply for the card, and after you get your first 18 statements they will start charging interest on balance transfers. The exact time frame of a billing cycle will vary by issuer, but you should get a statement per month. My Discover card, for example, always closes its billing cycle on the 19th of every month. I think it's more common to have a 30-day cycle, where the date of closing will vary just because the number of days in a month varies.
I'd guess they say "billing cycle" instead of "month" so people don't think they mean calendar months.