I have a table that contains date-time values in this format:

START

1/13/2009 7:00:00AM

END

1/13/2008 2:57:00PM

I use the 'str to date' function to convert these into a date-time format.

How do I calculate a difference between them? And then sum it all up so that it displays in total hours (ie total hours for week is 40:53).

I was trying the timediff function but the results don't sum.

mysql
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