this is what install page says
Before executing the call in this section, note it can take a long time to finish. Fast Internet connections take only a few minutes, while slow connections can take twenty minutes or more (it is far slower over Tor). No progress indicator is shown, so do not interrupt the salt process once it has started or this can lead to an unstable system [archive]. [6]
However the link to “unstable system” goes nowhere, probably it should not cause a system to freeze, else it should say so IMO
any reason I can’t just install templates the way other templates are installed?
*note 4.0 has not qvm-template-gui