I have just recently started using Periscope for business. Primarily, I do a short (2-7 minutes) clips of things that startups and entrepreneurs would find valuable (motivation, tips, resources, etc.)

I'm still getting familiar with the platform, but so far the response has been pretty good. I'm sure it would be easy to do longer broadcasts (10-30 minutes) but I don't have the capacity to do that myself at the moment.

You may also want to consider Blab. It is another social network that is similar to Periscope, but you can have up to 4 live participants talking and you can still have viewers and commenters. It also has pretty good integration with Twitter.