Every jail, prison or detention center sets their time limits on inmate calls. You have to be mindful that there are a limited number of phones and the inmates wait in line to use it. If there were no limits you'd have some angry inmates who'd have to wait more than an allotted 15-20 minutes span. There are some county jails where the time is longer but's it's rare.
https://www.inmateaid.com/ask-the-inmate/how-long-do-you-get-to-stay-on-the-phone#answer
Accepted Answer Date Created: March 08,2016