I have for example a safety valve which has to be replaced and calculated the disassembly and assembly time for example to be 2 hours.
My colleague scheduler says he always sets the duration for this activity to 10 hours (in this case the length of a shift), because he is only interested in the fact that the work on the safety valve is done on a specific day during this shift and not exactly in which 2 hours it is done.
Is this good practice ? Why ? (or why not)