How to calculate last time issue happening in data table?

i have a datatable who showing the issue happening real time. datatable as below
example: time now 11:00

Issue Time count Last Duration
errorA 10:12 1 ??? ------------> should show 48
ErrorB 10:08 2 ??? ------------> should show 52

how to calculate last duration that make it real time against current time?

Thanks

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