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systemctl suspend-then-hibernate reads HibernateDelaySec, and unset it depends on the hardware: a machine with a battery hibernates on a low-battery alarm at an hour nobody chose, and one without falls back to systemd's 2h default. 90 minutes states a ceiling both machines share. A laptop can still hibernate earlier, because systemd runs both timers and takes whichever fires first.
The number is a tradeoff and the drop-in carries it: long enough that stepping out of a meeting costs a screen unlock rather than a passphrase and a full resume, short enough that a laptop left in a bag drops its encryption keys out of RAM. A suspended machine is still holding them.
Numbered 60- because systemd reserves 10-40 for vendor drop-ins under /usr and 60-90 for local ones under /etc. A 10- file here would sort below a vendor drop-in and quietly lose to it.
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