Can I use my OPUS monthly card as much as I want in a day?

I would be new to Montreal, so I was looking at how I'm going to be commuting and calculating how much I would be spending on it and the OPUS CAM monthly card is around 73 CAD, but I was wondering is the fare for the monthly card meant I could use it as more than once a day for round trips? Or would it deduct the money on the card according to a single trip or round trip or how many times I use the card in a month?
 
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