Some offers require monthly spending while others just a total amount during promo period. (dannydealguru.com)
No interest will be charged on promo purchase and equal monthly payments are required equal to initial promo purchase amount divided equally by the number of months in promo period until paid in full. (morrisathome.com)
Those that do, often give users around a 12 - month promo period. (valuepenguin.com)