There is no fixed number of days for advance booking. Srisailam darshan and seva tickets are released month by month: all tickets for a month are released around the last week of the month before.
For example, October tickets are released around the last week of September. So for 1 October you can book about one week ahead, and for 31 October about five weeks ahead.
Sparsha Darshan is sometimes released first. Sometimes Sparsha Darshan tickets are released first, and the other darshan and seva tickets about 2 days later. If Sparsha Darshan tickets for a month are already released but your seva or other darshan is not showing yet, check again after a couple of days.
Book as soon as possible after release. It is best to book as soon as possible after the tickets are released.
Once a month's tickets are released, you can book any date in that month that still has tickets, until the day itself.
This applies to Sparsha Darshan, Athi Sheeghra and Sheeghra Darshan, and Sevas such as Abhishekam, Kumkumarchana, Homam and Kalyanam. VIP / Protocol darshan is different: the recommendation letter must reach the Protocol Department at least 2 days before.
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