VoIP provider Maximum Call Duration options

I have upped the 3CX maximum call duration to 8 hours but apparently our provider (Broadvoice) has a hard-coded limit of 5 hours. I have opened a ticket with them but the response was 'we have forwarded it to the dev department as a future feature'. Are there any providers that have an 8 hour limit? I looked at voip.ms but theirs is 6 hours max.