I chose bug fixes for ever, but I don't really believe it should be forever but certainly for as long as the product is on sale.
Once the product is no longer on sale, then the only thing I'd expect fixes for is a major major bug which hopefully by then doesn't exist. The odd, this paragraph in this particular book renders without a flush margin kind of bugs I'll live with.
Even then I accept that at some point support has to end completely. If they manage to provide the odd fix for major bugs for a few years after the product is no longer sold, that's good enough for me. Chances are any product that still needed a lot of fixes by that point would have been sold/returned long before
