The only way one can reach Sikkim is by passing through West Bengal. So you have to take a flight for Bagdogra from Hyderabad. From there you can hire a local taxi as it is just 120 kms from there.
For more - http:/www.indiatoursguide.org/sikkim/how-to-reach-sikkim.html
2-3 days
By train upto Nandyal and next by any road means.
three days
i would say 10 days
It depends upon the speed of the flight.
Sikkim's population is 607,688.
C.M of Sikkim: Pawan Chamling
Sikkim use the Indian Rupee.
it takes upto 8 to 9 hrs
international airport
The state is Sikkim - it has a population of 540,851, as per the census of 2001.
Mallikarjuna temple can be reached from Delhi via Hyderabad. The temple is apprx 150 Km from Hyderabad. One can visit the temple and come back the same day to Hyderabad. There are simple hotels as well in Srisailem if one wishes to stay overnight.