Question: In a 60-year-old man with moderate renal insufficiency, treatment is started, without administration of loading dose, with a digitalis medication. Under these conditions, the half-life or plasma half-life of digitalis is estimated at 72 hours. Indicate how much treatment time in days should elapse from the start of treatment to reach the steady state concentration or equilibrium concentration. 
 Options:  <1> In 3 days. <2> Between 3 and 9 days. <3> Between 12 and 15 days. <4> More than 30 days <5> More than 60 days
3