If I am not completely mistaken, this opens up a whole new route for targeted treatments. Now the question is, how long does it take from diagnosis to the creat

If I am not completely mistaken, this opens up a whole new route for targeted treatments. Now the question is, how long does it take from diagnosis to the creation of a viable amount of synthetic blood for treatment? Say you have cancer and these cells carry a targeted anti cancer drug directly to the tumor (because they in turn need much oxygen). How long would it take from biopsy to having a liter or so of that stuff ready?