well . rajdhani tt can be like this
tvc-majn tt same. halt for 15 mins at majn for loco change from wap/wam 2 wdm/wdp. majn-pnvl same travel time. halt for 15 mins again at pnvl for loco change from wdp/wdm 2 wap/wam.
by this time taken for 2916 kms journey becomes 40 hrs(average)