A $$12-$$hour clock loses $$10$$ minutes each day. The clock will first return to the correct time in． 
Overseas Competition->Knowledge Point->Distance Word Problems->Clock Problems
Clock shows the correct time after a $$12-$$hr loss. With a $$10-$$min. loss daily, it takes $$6$$ days to lose $$1$$ hr \& $$72$$ days to lose $$12$$ hr. 