User Registeration emails have only 10 mins to verify

Hi, we have developers accessing our APIs and we see that the users are only given a 10 minute validity for them to confirm the identity. This is a problem for us as our and our customers corporate email servers have firewall rules that blocks / delays the sending of emails to them and they are unable to proceed further.
Is there any configuration that I can change to allow for a more flexible time to validate the user. Something along the line of 48 hours?