As far as i know (i´ve never done a registration in Venezuela, but i´ve read the regulation) there´s no official fees for the registration...you will need to pay for the translation of documents (in castellano) and for some certificates, but there´s no registry fee.
The regulation says that the Health Ministry has 20 days, after you send all the necessary documentation, to decide to give the registration (or not, if tyhe documentation lacks what it´s needed). Again, i´ve n opractical experience, but as the regulation is simple (basically documentation) i would say that it can be done very quickly indeed.