Ur experience of 5:35 hrs for 208 Kms in itself speaks volume about ur suggestion backup & how better u support it against a route worth 2.5 hrs!!
Anyway, the run comes like: 4(+1)+5(+1)=11 hrs (which easily gonna shift as 12 hrs)...to avoid congestion @ ALD with pass-thru trains, u jam MGS/CNB for LC along with turning SF Sampark Kranti into likes of Unchahar!!
That quite showcase ur experience!!