Use a consistent structure:
. Requirements ( min): Functional, non-functional, constraints
. Estimation ( min): Users, QPS, storage, bandwidth
. High-level design ( min): Core components, data flow
. Deep dive ( min): - interesting components in detail
. Trade-offs ( min): What you sacrificed, alternatives considered
. Wrap-up ( min): Scaling, failure scenarios, future improvements
Adapt timing based on interviewer cues. If they want to go deep early, follow their lead.