A. Try to get accomodation reserved in advance via online portal in Tirupati.
B. At Tirupati, early morning reach designated counter where we get pass for darshan (free).
C. Reach before time and have peaceful and hassle free darshan.
To...
more... answer your question : without darshan pass - time might vary 8 to 12hrs or beyond.
With darshan pass (free) 1hr to 2hr max.
Weather is nice, bit hot at Tirupati but not at Tirumala.