Ideally each call remains in queue for 5 minutes. 

If you want to reduce/change the time as per requirement, you can follow the below steps:

Step 1: Login to your account (web.callhippo.com)

Step 2: Go to Numbers > Number Settings > Call Queue

Step 3: Turn on Call Queue > Click on Edit button and set the duration

 

C:\Users\Appit Simple\Downloads\Call queue duration.png

 

The call will remain in the queue for the duration you have set and at last go voicemail.

 

For any queries, please contact us at support@callhippo.com