A property manager we work with was missing 40% of inbound calls between 5pm and 9am.
Not because nobody was working. Because the two people who could answer were already on other calls.
We put a voice agent on the overflow line. It does three things: takes the address, takes the issue, books the callback slot. Anything it cannot classify goes to the on-call phone.
Six weeks in: 91% of after-hours calls answered, and about 12 minutes of human time a day spent cleaning up what the agent got wrong.
The 12 minutes is the honest part. Anyone telling you it is zero has not run one.