With the current time, at least in EKM, it does have more than 10 hours for some cleaning etc. Not sure if the extension to TVC will leave it with any time ?
TVC does have the KCVL-Bikaner train. But yes i have heard the demand to extend Marusagar to TVC for quite some time now. It is only due to lack of space etc and other constraints that railways is not going ahead with the proposal.