How much time is required to be off work after having arm lift?

You can resume your daily activities from the next day. Cardio exercise you can start from 1 week post surgery. Heavy weight training should be avoided for at least 3 weeks. 

Your plastic surgeon will be your best resource when it comes to providing you with "return to activity" guidelines. He/she will know exactly what procedure was performed and what kinds of activities you wish to return to. In my practice, I ask that patients take about one week off "desk job"  activity; more strenuous work would require more time off (depending on the specifics…).You may find the attached link, dedicated to arm lifting surgery concerns, helpful to you. Best wishes.