researching(summer), courses(fall), 150-days issue?

[JohnSmithh]

Hello,

I am an international student in Montreal. (master degree)

Situation:
The summer term starts on May 2nd.
I have landed in Montreal on April 1st.
But my supervisor told me to take courses A,B on Fall. Meanwhile you are researching on X.

Question:
I have heard that there is a limitation for international students for 150 days, says that they can't do nothing in these 150 days.
Since I will participate in the classes from Fall, Is the 150-limitation-days something I should be concern about?

I would appreciate your helps.

Thanks

 

[JohnSmithh]

Can somebody help me please?