¹³⁰I decays by emission of beta particles to form stable ¹³⁰Xe. A sample of iodine-130 was recorded as having 1245 disintegrations per second at 11:00 a.m. on June 23. At 9:32 a.m. on June 24, the same sample produced 350 disintegrations/s. What is the half-life, in hours, for the beta decay of ¹³⁰I?