It's rare you lose it right then and there. Usually you'd have your employer extend it 2-3 months before it's due to expire. Also the immigration services usual

It's rare you lose it right then and there. Usually you'd have your employer extend it 2-3 months before it's due to expire. Also the immigration services usually give you several weeks extension when you explain your case/need to sort out things or will let you stay on a visitor visa (30-90 days depending on country of origin). But the main difference for me is that you have a set date with an expectation of either leaving or extending your stay.