What type of Darshan ticket do you have and time slot? Normally the trains morning trains reach Tpty late by 30-60 mins so take 800. take room downstairs only freshup and U can board the bus directly to Tirumala opp to railway station or bus stand it will take 60 mins so u I'll reach top by 1000-1100. Once u get into Q line with time slot it will take min of 3 hrs to come out including collecting laddoos. Say you complete all by 1600 get into bus by 1630 u will reach down at 1730. So it's very tight schedule. The time slot u book ticket online should be 1100 or 1200 for special Darshan rs 300 ticket. Better to book from Mon to Thursday.