I had an ORIF with a volar fixed angle plate placed 2 days ago.  I am supposed to keep my wrist in a splint for 2 weeks before I am allowed to do anything.  Is this normal?  I would think that my muscles would waste away in that time.  
The protocol that your surgeon gave you sounds like the standard protocol-- no movement for two weeks and no strengthening until week six.  A recent article has found it to be more beneficial, however, to begin passive motion fairly immediately and strengthening as soon as two weeks. This would be a good discussion to have with your surgeon.