Scheduling and Time Management
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An interview scheduled too tightly against a subject's other commitments rarely reaches its full depth, since both parties remain aware of the clock throughout, and that awareness quietly shapes how expansively a subject is willing to answer even the more open questions. Both parties tend to sense that pressure without either one ever naming it directly.
Building in more time than seems strictly necessary tends to pay off, since the richest material often arrives after the planned questions have been exhausted, in the unhurried space that only appears once neither party is watching the door. The richest material in many interviews arrives only once the planned questions have already been exhausted.
Where a firm time limit cannot be avoided, being transparent about it at the outset at least allows the subject to pace their own answers accordingly, rather than discovering partway through that the conversation must end sooner than they expected. A subject who knows the limit in advance can pace their own answers with that constraint clearly in mind.