I'm going on vacation starting today at end of day, I've been working the same schedule for about a year and that's 5am to 130pm 40 hrs a week. When I get back the next guy in line is the second shift mechanic and he starts at 230 to 830, they want me to work a double and or start at 10am and leave at 830pm. Let me remind you that we are under staffed in or dept and it's being done on purpose because it's the most expensive when ot comes to budgeting and or general manger and mangers bonuses, at this point I'm by myself doing the job of 2 others.. I'm not changing my schedule for lack of Incompetence and lack of being prepared on that on management part.. what would be a good way to go about saying no