Every morning.
Lodging with my brother in law temporarily though, which means mornings are spent going in one direction to drop little un' off and then doubling back for work, a close to two hour commute from home door to work door. I am forced to shower and shave in the evening. Takes all the fun of the scents and aftershave out of shaving.
I think you season your skin by shaving, so if you want to shave more frequently than once a week, step it up slowly and make sure that you give your skin some rest in between.