Today I am in different mood to answer.
I would like to advise you to restrict your working hours even during your out station, including travel time. It is against the Law. There is no provision in S&E Act or any other Act, of Compensatory Off or any other leave for your travel time and work time outstation.
Please be in mind, certain issues are sorted out by talking with the boss or the employer rather than looking into the Law.
2nd May 2018 From India, Mumbai