App Store / Google Play update
Days to weeks, and some users never update
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Wait for review
Hours to daysApple and Google review the new binary. Nobody has the fix yet.
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Wait for the store rollout
Up to 7 daysThe approved build propagates through the store, often as a phased release over several days.
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Wait for Wi-Fi, charger, and an idle phone
Nights to weeksAutomatic updates run in the background, usually overnight, only when the phone is on Wi-Fi, charging, and not in use.
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Auto-updates turned off
Manual onlyThese users keep the old version until they open the store and tap Update themselves.
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Not enough storage
NeverThe full app download does not fit, so the update silently never installs.
Weeks later, part of your users still run the broken version.