A few items about Skype for Business PowerShell https://technet.microsoft.com/en-us/library/dn362795(v=ocs.15).aspx
- Only 9 PowerShell Sessions per domain
- Only 3 sessions per administrator
- After 15 minutes of inactivity, the session will automatically disconnect itself.
Fellow MVP Curtis Johnson notes PowerShell sessions will be throttled if there is repeated read or write PowerShell executed. See his full article: http://blog.insidelync.com/2017/09/skype-for-business-online-powershell-throttling-limits/
My Experience
- It seems like credentials timeout after about 2 hours
- Retrieving settings in small numbers can be done repeatedly (based on tests)
I would welcome your input on what you have found on Skype for Business (Phone System) PowerShell throttling.
How to get All Services in one PowerShell Session:
https://docs.microsoft.com/en-us/office365/enterprise/powershell/connect-to-all-office-365-services-in-a-single-windows-powershell-window