Hi Mauricio,
From the description of INT in the Function Browser:
The INT function returns the nearest integer that is less than or equal to the number.
The error message shown in your screen shot explains the cause of the error more directly. Translated via google translate, the English version is : "INT argument 1 cannot be a duration"
Apparently, the value in J4 is a Duration value. It can be converted to a number representing that number of Days or that number of hours using DUR2DAYS, DUR2 HOURS or one of the other DUR2 functions.
"excl works perfectly" has no significance in this question for two reasons:
Numbers is not MSExcel, nor is it a clone of Excel.
Excel does not support Duration values, so it never presents Duration values to the INT function.
Regards,
Barry