What does keep track of time mean？

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'Keep track (of someone or something) is an idiom meaning you 'monitor someone or something; have information about what is happening or where somebody/something is. 
= 'keep an eye on someone or something' 
= 'have an eye on someone or something' 
= 'kepp watch on someone or something' 

It is the opposite of 'lose track of someone or something' (= to forget where someone or something is; to lose or misplace someone or something): 
'I lost all track of time (= forgot what time it was).' 
'When I get tired, I tend to lose track.' 
'The mother lost track of her child and started calling her.'

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It means you should be aware of time every time u are doing something so that u don't spend too long time on silly things. I use beep hourly alarm app for  this https://play.google.com/store/apps/details?id=com.mindedges.beephourly

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mean blow with time....dont get behind

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Hi ... It means then you have to keep an eye on the clock...

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more than being aware of the time, "keeping track of time" would also mean organizing the task with respect to the time.  here, you literally assigned a 'completion time' to each process of a certain task.

:)