How did you add a minute column in your attribute table. I know you need to add a new field and then use field calculations but then I get lost at what formula to use to be able to get minutes.
I found a solution, in order for the minute attribute to be displayed when creating network links, you need to sign the "Minutes" road layer attribute, calculate using the formula (length in km / speed (if the speed is 5 km/h = 5000 m/h = 5000/60 = 83.3 m/min)
