You are only on standby one month a year. But for that month the company basically owns you. It's hard to make any plans. The 777 schedules are much better than the Airbus. One thing that can be a little misleading is rest days are not counted as days off. But you are obviously at home and not working. So you might have 3 or 4 extra days off per month that are called "rest days" instead of off days and do not count towards the minimums. I've never had less than 14 days free from work on the 777 except for my standby month.