There's no misinterpreting what I posted: it clearly says BID.
There's no misinterpreting what you posted: it clearly says SID.
It says fenbendazole has a longer half-life than Albendazole, but that doesn't mean it has a long half-life compared to other wormers.
The very fact you have to use so much, for 3 days in a row, proves how weak it is ... when (say) you only use a drop of moxidectin, which lasts for 30 days.
The question about fenbendazole is, "Do we use it SID or BID for 3 days in a row?" The section of the book you posted says SID, the section I posted says, "However, treatment must be given BID for 3 days."
True, it doubles the cost.
Jack