SBY shifts are generally covered through your reserve month. Which to be honest is a pain in the a**e as you don't know what you are doing till 6pm the day before. Although saying that I ended up not doing too much work about 45 hrs on the 777. When on standby you have to be ready for pick up in 30 mins so you are tied to your accommodation or very close by.
You get your 1 in 7 days off.