Hi

But i didn't understand why overtime work changes duration. What is the relation between them. And is there a formula, how overtime work effects the duration value?

practically speaking, if a resource works 8 hours, 10 hours or whatever hours in a day, the duration remains the same 1 day. Similarly if a resource works 8 hours and does 2 hours overtime, the duration still remains 1 day, by adding 2 hours overtime work duration doens't change... but why then it does in MS Project?

thanks