Test-Flight App beta testing time limitations

Question

I need to submit my binary files over the air without pushing app to app-store. one solution is using enterprise program, Test-Flight App Beta Testing we can send binary files to external users to limit of 1000.

My Questions is :

1. will apple take beta review (following apple guidelines) of the app?
2. only iOS8 build will be supported?
3. Is there any time limitations for the app in beta phase and then apple will revoke the app?because we are not submitting app to app store.

Is there any alternative SDK's through over the air so that we can send binary files to external users?

Any help will be appreciated.

Thanks

Answer 1

FYI (as of Jan 2018) (TestFlight link)

Beta App Review is required for builds tested by external testers.

External testers limit: 10,000 (through invitation by e-mail)

Expiration of beta apps: 90 days

Hope, it might help someone out there.