Answered question
Is the $2 off upgrade for Fizz Internet lasts for every month forever until you leave Fizz? Or is it only good for a limited time?
An upgrade is a long-term reward that boosts your plan every month, like additional mobile data or a monthly rebate on the price of your Home Internet plan.
Every upgrade is valid for two (2) years starting from the date you receive it (whether you apply it to your plan or not). So, keep an eye out and activate your upgrades as soon as possible to fully take advantage of them.
More info here: https://fizz.ca/en/faq/what-do-i-receive-my-rewards-program
Other answers
Every month for 24 months from the reception
2 years later it will expire
Yes, for 24 months :)
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Recurring for 24 months from the reception of that upgrade !