How long is the "down time" for this procedure; how long should I expect to be out of work?

You can expect to resume regular activities in about 1 to 2 weeks.  Although exercising should be be reserved for after the third week.  It really is individual but the swelling can be pronounced involving cheek augmentation. There is bruising and of course a support will be worn at night to alleviate tissue stress and to support the healing tissues correctly.  I wouldn't make any plans to attend any weddings or other functions where you will be high profile for at least 4 weeks.  Most patients return to work within a week but two weeks is nice to take off during this time to allow bruising to dissipate.  Plus if you have to talk a lot you may wish to stay home for about 2 weeks.  Or return to work when you feel up to it.  If you have a very laborious job, it is best to wait 2 to 3 weeks.