With Kate and Petunia it took just about a year to get multiple negative fecals.
I can tell you that Petunia was so loaded with them that she pooped massive amounts of blood for the first month. We went outside with her every time in case we needed to scoop her up and go to the E-Vet. Then one day the stools were magically normal.
We modified the Prison Protocol due to their age (each was 11 when they arrived from the farm) and stuck to the schedule. Drontal Plus on the first of each month and Advocate (Advantage Multi) on the 15th. There were a few courses of Metronidazole for their tummies as well. Gradually each one went from Loaded With Hooks, to Positive With Eggs, to Positive Antigen and finally Negative.
Each of them had a point where they were obviously feeling better because they started playing. Kate had never played and at about 6 months in, she would come in and get me out of bed every night at midnight, make me go to the living room, and she would do spins and fling toys.
Did Wiki come from a farm or off the track? Just curious. Kate and Petunia came from the same farm and were absolutely loaded with hooks.
EDIT - I neglected to mention that Mark and LaVida are both currently being treated with the same protocol. Even though they each had different owners prior to arriving here, they were both positive on arrival at their first vet visit. Neither has a bad case of them. Mark had been in his prior home since 2015 or so when his owner passed away, and LaVida had been in her home for a year or so when her owner passed away. They were both well cared for, so it just shows that the hooks can crop up anywhere or anytime. Mark has had one clean fecal after two months of our modified protocol. LaVida is still positive for the antigen but had no eggs. We are doing another month before we retest.