Ask someone senior why they want the next role, and the answer will be polished, because they have given it before and refined it slightly each time. Ask them, instead, how they describe the role they are currently in, the one they have not yet left, and something much harder to prepare for tends to arrive in its place.
Most conversations at this level are built around the forward-looking question: what draws you here, what are you hoping for next. It is a fair question, and also the one every serious professional half expects, which means it has usually been rehearsed into something smooth. The backward-looking question, how someone talks about where they are now, gets asked far less often, and answered with considerably less control.
There is a particular kind of person who has left several roles under difficult circumstances and describes every one of them the same way: nothing personal, a decision from above, simply time to move on. Said once, this reads as professionalism, and probably is. Said about a third employer, in the same even tone, with the same careful absence of detail, it starts to read as something else. Not dishonesty, usually. More often a fluency in leaving cleanly, which is a genuine skill, and not always the one a house should be appointing for.
Set that against someone who struggles slightly to explain why they are even considering a move. Who credits a manager they are currently frustrated with. Who admits, almost reluctantly, that a decision which hurt them was probably the right one for the business at the time. That hesitation is not weakness. It is evidence of a person still holding two things true at once, which is closer to how most senior departures actually work, and considerably harder to perform convincingly across an hour.
This has nothing to do with loyalty treated as a virtue in itself. Someone can leave a role after a short time for entirely sound reasons, and someone else can stay in an unsuitable position for years, out of exactly the wrong kind of loyalty. What matters is not the length of the stay but the account given of it afterward: whether that account still holds some complexity, or whether it has been sanded down into something frictionless, and suspiciously identical to the account of the role before it, and the one before that.
Discretion complicates the picture further, because the professionals worth appointing at senior levels are often the ones with the most reason to say very little. They have signed things. They hold information a former employer would rather keep private, and the ones worth trusting are the ones who go on protecting it, even when a fuller answer would make them look better in the room. Someone willing to speak too freely about a previous employer, however entertaining it makes the conversation, is showing you precisely how they will speak about this one, later, across a different table.
The temptation, once a conversation is going well, is to treat an unguarded comment as an opening, an invitation toward something closer to gossip. The better instinct runs the other way. The most useful thing offered in these conversations usually arrives despite someone's reluctance to say much, not because they were finally persuaded to. A search conducted with care leaves that door closed, and simply notices how carefully it stays that way.
None of this can actually be verified in the room, which is worth remembering, because there is a later moment when it finally can be. Somewhere between an offer being accepted and a first day arriving sits a stretch almost nobody discusses in the interview itself: the notice period, the weeks spent finishing what was started at the place someone described leaving. It is the only part of the story anyone gets to watch rather than take on trust. A person who spoke with real complexity about a departure, and then spends that stretch training a successor properly, closing out relationships with the same care they always brought to them, and staying reachable once the desk is cleared, has simply continued being the person they described in the room. A person whose account sounded generous and considered, and who then disengages the moment a start date is confirmed, was very possibly telling a story that was true for exactly as long as it was convenient to tell it.
This is why the length of a notice period matters rather less than what a house chooses to ask about it. Two months given with real attention is a better predictor of the next two years than a fortnight served out resentfully and rushed through by both sides. A house that treats notice as dead time, something to be waited out before the real work begins, is skipping the one part of this entire process that cannot be rehearsed, prepared for, or said convincingly across an hour. It has to be lived, in real time, by someone who no longer has any professional reason to make an effort, and either does, or does not.
None of this shows up on a CV, and rarely in a first round of references, which tend to be chosen for their willingness to say only kind things. Some of it shows up in a single unscripted answer to a fairly ordinary question, asked in passing, often near the end of a conversation that has otherwise gone smoothly. How is it there, at the moment. Not why are you leaving. How is it. The pause before the answer, and whatever fills it, usually says more than the thirty minutes that came before it. The rest shows up later, in a handover nobody was really watching.
Most conversations about a person's next move spend their time on the destination. The more reliable evidence sits earlier and later than that: in how carefully someone describes the place they have not yet left, and in how well they go on to leave it once they finally do.