Desk research against primary sources, with the issuing authority linked where a page states an official fee, rule or deadline.
The tier you fall into is decided by visa category, not by how the cancellation happened or who initiated it — a golden, green or blue residence holder gets 180 days regardless of whether they resigned or were let go, while someone on a guarantor-issued permit gets 60 days under the same circumstances. Confirming your own category with ICP or GDRFA before you plan a departure date matters precisely because these tiers are not visible from the visa document itself in a way most people would recognise.
Because the days are calendar days rather than working days, a grace period does not pause over a weekend the way a processing timeline sometimes does — 30 days from a Friday cancellation still ends 30 days later, not after 30 working days have passed. That distinction is what turns ‘I have about a month’ into an actual overstay for people who mentally round weekends out of the count, and it applies the same way whichever tier — 30, 60, 90 or 180 days — you fall into.