Planner-list Using month or trimester instead of day for work duration

["Eric DUMINIL" <eric duminil gmail com>]

Hello everyone!

I'm using Planner 0.14.2 on Ubuntu Feisty, and find this software extremely useful for everyday use.
I have been wondering for a while if there's an easy way to use months or trimesters for tasks duration instead of days.
We are working on a 5 year-long project draft, and it would be much easier to type '3m' instead of '90d', especially since we use it more as a draft than a precise project planner.

I hope that I've been clear enough and that someone could find an easy solution!

Thanks a lot for your support and this software,

Eric