Is there a limit to how many times a parent can extend a single stay under a super visa?

Generally, yes — there is typically some limit, tied to IRCC's current rules, on how long or how many times a single stay under a super visa can be extended from within Canada, though the exact limit changes over time and needs to be confirmed against IRCC's current published requirements rather than assumed unlimited. A super visa's long overall validity as a document does not mean any one visit can be extended indefinitely — the authorized stay granted at entry, and any extensions of it, are separately capped.

This distinction trips people up because the visa itself may remain valid for future trips well into the future, which can create the impression that a single ongoing stay can just keep being extended. In reality, once a stay reaches whatever ceiling currently applies, further time in Canada on that visit generally is not available through another extension, even though the visa could still support a later, separate entry after leaving and returning. Anyone planning a long visit that might approach this kind of limit should check the current rules before the authorized stay is due to expire, since applying too late, or assuming one is not needed, can lead to an unintentional overstay. An immigration lawyer can help confirm the current limits and timing for a specific situation.