How do I change the timeout on a jasmine-node async spec

You can (now) set it directly in the spec, as per Jasmine docs.

describe("long asynchronous specs", function() {

    var originalTimeout;

    beforeEach(function() {
        originalTimeout = jasmine.DEFAULT_TIMEOUT_INTERVAL;
        jasmine.DEFAULT_TIMEOUT_INTERVAL = 10000;
    });

    it("takes a long time", function(done) {
        setTimeout(function() {
            done();
        }, 9000);
    });

    afterEach(function() {
        jasmine.DEFAULT_TIMEOUT_INTERVAL = originalTimeout;
    });
});