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The number of minutes between two timefields

I find example for solve this problem:
http://www.trialdatasolutions.com/tds/howto/timediff.jsp

But I have another a repeating item group. It looks:

Time Difference
T1
T2 T2-T1
T3 T3-T2
... ...

I want to calculate minutes between items in a column. Has somebody solved such task yet?
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