Time limit to avail Compensatory casual leave for working on Weekly rest days and extra working hours

Please aware me about Compensatory rest for working on weakly rest days and for extra duty hours. I am working in Electrical general service as technician some times i am working in weakly rest days and extra working hours due man power shortage. For this i have not availed Compensatory rest during one month due to Ignorance. In charge of the depot  also not supposed me to avail C.R and not found slot in this month to avail C.R due to man power shortage. So is there any possibility to avail C.R after one month that they are saying lapsation  period for C.R.

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