Pilot Vacation Days

I have my dreams of becoming a pilot for either (delta, AA, or united) and i am wondering how many vacation days they usually get and can the airline ever call you on duty even on your vacation days?

I plan to save up my vacation days for a VERY important day: August 12, 2045. A total solar eclipse will pass over my hometown of Orlando, Florida. I know 2045 is a long way out, and i’m still a baby, but i am just super excited for this event and it would be a real bummer to miss out on it because they called me to fly to a different state.