Library /sys$common/syshlp/pca$help.hlb SET, COVERAGE, Qualifiers, /UNTIL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /UNTIL:n

    Causes each test coverage breakpoint to be removed the nth time
    it is reached during program execution. By using the /UNTIL:n
    qualifier, you can determine whether a program location is
    executed at least n times. If you omit the /UNTIL:n qualifier,
    each breakpoint is removed the first time it is reached.