Baltar is a clone

I'm hearing that Baltar can't be a clone because it takes 36 hours to download memories into a new body and bring it to life. This comes from comments made between Caprica Six and Boomer after the apartment building bombing. The delay in that case was because of the large number of dead. It would just take that long to bring everyone back. Cylon Zena was the last to be killed (by Caprica Six) so she would be last in line. If the Cylons knew that Baltar was going to die and wanted to have his clone ready to go it would have taken much less than 36 hours.