Hi, i have a column date/time, just only with time,
i want sum all the rows, but i dont know idea, i have tried with math but i have not been successful
Hey Alvaro welcome to the community 
You should be able to do that with a rollup column.
with the rollup option it doesn’t count well, and it doesn’t let me add well if it doesn’t count
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Yes you will need to convert it to a number first. What are you trying to count… hours… minutes… something else?
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