So I get the my next kit from UPS today. I am mentally preparing myself for the fact that I will have to make a yeast starter (which i have never done.) I have read that you should plan to make the starter 12-18 hours before you pitch for maximum reproduction. My only concern is that I'm not sure quite yet when I will be brewing. I have to coordinate with a friend that I will be brewing with. Will the yeast remain viable for "a little while?"