Repeated teaching classes and stopping date

[Xavier Garrido <xavier.garrido@gmail.com>]

Dear Orgers,

I'm trying to move to =org-agenda= and I'm converting some of my Google 
Calendar entries into Org agenda entries. I'm facing an issue with 
repeated tasks and how to properly stop the event. Consider the 
following entry :

* [Master 1] Nuclear & particle class
<2015-01-21 mer. 14:00-16:00 +1w>--<2015-03-22 dim.>

For me it means, I will teach every week @ 14:00 to 16:00 until the 22th 
of March. I am surely doing something bad since the events actually 
appear every day until the 22th of March. It basically works when I 
remove the --<2015-03-22 dim.> but then how to stop the repeated tasks.

Sorry if the answer is obvious but I have read org-mode manual 
(http://orgmode.org/manual/Repeated-tasks.html) and other "timestamp" 
related pages and I didn't find a way to do that.

Thanks for your help,
Xavier