We usually specify that we can do these out-of-window deployments for a mid-day restart (mid-day PST usually unless otherwise specified by the customer).
These restarts are usually no different to regular studio pushes where the downtime for the deployment to take effect can be anywhere from 1-15 minutes. However, we also require explicit approval from customers that we can go ahead with scheduling the restart - especially during business hours. Please keep this in mind whenever you need to schedule something urgent.
If you have further questions about deployment out-of-window, please contact support and we will promptly address your questions.