I would divide the card count by the number of days you want to be done in. It depends on which zanki deck you got, and whether or not you got the expansions. As an example: 22000 cards in Deck X, and I want to be done before dedicated, I should probably be done in 300 days. 22000/300 = 73.33 new cards per day. Reviews should be maxed out.
If you like making your own cards, do it. If not, check out Bros, Zanki, or Lightyear. All comprehensive decks that will take most of the year to get through.