In lab, you have patented the creation of a metallic radioactive isotope called Sciencebowlium-23. But, after a period of time, the sample radioactively decays into oxygen-16, where it becomes a gas and dissipates into the atmosphere. You create a sample of Sciencebowlium and weigh it as 500 grams. Exactly four days later, you weigh the sample at 62.5 grams. How many hours long is the half-life of Sciencebowlium-23?
32