As an example, the transfer stage, say, at 18 h would result in tn=t1=18 h and t0=t1=0. If the next loading stage is between transfer and 5 years (17,520 h), when losses are considered stabilized, then t2=t1=17,520 h and t1=18 h. Then , if fpi is the initial prestressing stress that the concrete element is subjected to and fpl is the jacking stress in the tendon, then