You will want to have your ortho complete this paperwork ASAP.  It takes up to 2 weeks if you use a messenger service at a local dmv location.  If you mail it, it will take up to 5 weeks.  They are well aware of the need for a temporary placard, especially if you will be driving.  Luckily it was my left foot, so I am able to drive to work, etc.  If I want to shop, etc.  A placard will make it much easier.  Don’t be a martyr.