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Time is generally written as seconds (as the standard SI unit); however, it can be represented as minutes or hours depending on the duration of the reaction. If you do happen to change time from seconds to minutes or from hours to minutes and so on, remember to change the value and units of your "k" value so that the units at the end match up.
It usually just depends on the units of the information you were given in the problem. I'm pretty sure you won't be marked wrong if you leave your t in either minutes or seconds (or even hour) as it is the correct number of sec/min/hr. I hope this helped!
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