Not a permanent search in disguise.
If the brief tells me the seat is permanent, I say so in the first call, and we run the permanent search instead: under 30 days, with the 12-month guarantee. An interim in a permanent seat means you pay for the chapter twice: the interim now, and the search you should have started first.
Not a way to postpone the decision.
If the scope grows twice by day ninety, it was never fractional. And a fractional executive is not an advisor with a title. An advisor is a few decisions a month with an end date. Do not give that the C-level title, you will not get it back.
Not a lower standard.
Every interim and fractional executive I place goes through the same three fits as a permanent hire: skill fit, stage fit and need fit. The stay is shorter. The check is not.