Run the ad schedule on your phone coverage, not on the valley's clock
In a metro with a large shift-working population, the ads should be live when a human can actually pick up.
Pull your answer rate by hour before you set a schedule. Most firms discover a block of unanswered calls at hours nobody planned for, and buying more clicks into that block is buying voicemail at auction prices.
You have three honest options. Widen staffed hours, hire an answering service whose script takes the facts and stops short of anything resembling advice, or restrict the schedule to the hours you cover. All three are defensible. Pretending the phone is answered is not.
If you use a service, script it for this trade: case type, the date printed on any document they are holding, whether anyone is detained, best hours to call back, and a promised callback window you will actually meet.
Sunday morning and early weekday mornings are real hours in this valley. Test them deliberately with a small budget before you decide they do not work.