We have an hour for lunch.  Mixed bag here.  I try to work out but lately that's been a bust - can't get back in the groove.  Lately I've only been taking 1/2 an hour, go munch something I brought in and work on a needlepoint craft project.  My office is convenient to mall (food court) and many other shops, so lunch time errands are easy.  We also have two very nice picnic areas and lately the weather has been wonderful to just sit outside and commune with nature.  We have a cafe and convenience store in our building (as well as dry cleaners and shoe shoe stand!) so if weather is inclimate and I didn't bring a lunch I can get something from one of the stores.  The cafe tries to change it up one day is a pasta station cooked to order, another a sushi bar, plus salad bar and steam table.  After a while it's all the same and can be expensive if done on a regualr basis.
Even on a really hectic day I try to get away from my desk for at least 15 minutes!