Man Apple really hangs their part time employees (who aren't college students) out to dry. It will be tough surviving on a 20 hour per week part time income when you have to be available fulltime . That means you won't be able to get another part time job to supplement your income. Whoever described part-time as the trenches wasn't lying lol. Try surviving off $14K per year.
Yes, that would make it difficult to plan ANYTHING if you can suddenly be told you are working full time today, but not tomorrow. Interesting.