By Guntur route it's 700kms for this u have to change loco. And by Warangal route its 780 kms. Just take Rajdhani Exp it takes 8:30 hrs time to reach Warangal with a single stop. From there 2 to 2 1/2 hrs for Secunderabad. Total 10 1/2 to 11 hrs for up journey and what about down journey. Ok let give 1/2 an hour for loco change. Total 22 1/2 hrs for reaching it's origin station. And what time left for maintenance.