calculation of a swap duration: 4 year swap, quarterly payments answer: floating duration = “one half of the payment interval”, then 0.5 x 0.25 my question: am I blind or is it written somewhere in the programm that we have to multiply the interval by 0.5??? thanks for your help

That’s the average duration. To get average duration of the floating leg of a swap, multiply payment period by 1/2. There - it’s written here.

Thanks… I recover my eyesight!