Almost half of listing inquiries don’t receive a response from an agent: DelPrete 

Consultant Mike DelPrete managed a team of undercover “secret home shoppers” to test the responsiveness of brokerages to online inquiries on home listings. The average time for a response to online contact was 8 hours and 17 minutes, but the median time was 39 minutes. However, he found that 47% of inquiries didn’t even receive a response, as brokerages left on the table many opportunities to cultivate a new lead.