It will take around 30-60s. You can read the guide how to install PWA apps on Google Support: https://support.google.com/chrome/answer/9658361?co=GENIE.Platform%3DAndroid
Follow the guide on how to install PWA on iOS:
Add Comick to Home Screen
- 1. Tap the share button on Safari's menu bar
- 2. Tap 'Add to Home Screen'
You have to allow the app to install on your device.