4 weeks until the half-marathon relay

As a beginner runner, I'm told that my only priority in my first 10K event (or in this case, 10.5K) is to finish upright and smiling. Yesterday I did my 9 mile long slow run. So I know I can do it. At my long slow run pace, I should be able to do 10.5K in about 1 hour 12 minutes. But I don't want to drag the partnership down ;-)