1) The duration that is listed in the skill description could have the new multiplied length of time displayed in the usual place but in a different colour to signify that it's increased.
2) The normal time for the duration will still be displayed in the skill description, but with the new added time in brackets, eg. with a 20% mod: "For 60 (+12) seconds, you are enchanted".
Option one would be the easiest to do, all it would take is a simple multiplication, and the game would round the new figure to the nearest whole number the same way it does now with damage modifications.
I'd like to know what you think
