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I have had the Evushield monoclonal antibodies, for (some amount of) protection against covid. The factsheet didn't answer my questions -- how soon will I be protected, and for how long -- and the nurse said to ask my doctor. I left a message with his office, and also mentioned those questions on a discord server.
A medical person who hangs out there said that the time to them being effective should be "quick, on the order of hours" and that the answer to the other question is more complicated. Half-life in the bloodstream is probably about for weeks, but to actually answer that question, even approximately,a person would need to know how many antibodies they injected and how many are needed to be significantly protective.
A medical person who hangs out there said that the time to them being effective should be "quick, on the order of hours" and that the answer to the other question is more complicated. Half-life in the bloodstream is probably about for weeks, but to actually answer that question, even approximately,a person would need to know how many antibodies they injected and how many are needed to be significantly protective.