In fact, no-one is sure how long the protection from these injections lasts, but it is probably over two years, and most vets are quite happy to do boosters at least three months late without starting a new course. (Which is much better for the cat.)
We have delayed injecting our breeding queens for over three months, and the vets have just boostered with nary a blink.
We have to be careful with timing for the show cats, because they must be done every year within the month or there'll be a fight at vetting in (which we'd probably lose) and must be boostered at least seven days before a show if they are due.
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We have delayed injecting our breeding queens for over three months, and the vets have just boostered with nary a blink.
We have to be careful with timing for the show cats, because they must be done every year within the month or there'll be a fight at vetting in (which we'd probably lose) and must be boostered at least seven days before a show if they are due.