Ceftazidime is a third generation cephalosporin which is administered parenterally. In this study, eight patients with chronic renal failure were each given 1g of ceftazidime intravenously. Both blood samples were taken and the pharmacokinetic parameters were obtained: Initial plasma concentration was 44.5 mg/L and the elimination rate constant is 0.0312 hr^-1

What is the half-life (hr) of Ceftazidime?