Eleven to four is the window where a missed call costs a guest refund
Turnaround work is discovered on a cleaner's walkthrough and dies at check-in time, so a plumbing company's answer rate during the middle of the day carries a cost no other missed call carries.
Start by measuring, not guessing. Pull missed and abandoned calls by hour for a month and separate the numbers you recognize as management companies from everything else. Most shops have never seen this view of their own phone.
Understand what the caller loses. A homeowner with a missed call reschedules. A manager with a missed call is facing a refund, a bad guest review or a relocation, and will call the next name on the list within minutes.
Fix the coverage before the copy. A second person on the phone during the discovery window is a bigger conversion improvement than anything on the website, and it is measurable within weeks.
Then close the loop on the ones you still miss. An automatic text within a minute saying we saw your call and are dialling you back recovers a share of them, and costs almost nothing to run.