I guess, I need that line. Suppose it's 23:45 right now. After 15 mins, refresh will happen. Next day starts after that. Remaining time for next refresh is 1 day(86400 secs) and user does not shut downs the system(GTG process is alive for 50 hrs) for next 50 hours. So I need to keep on refreshing at the start of each day and that line does that.