Q: iMessage recipient limit?

Hi,

Is anyone able to advise if there is a limit to the number of recipients when sending an iMessage?

There are a number of posts going back, that seem to hint there may be a limit but none seem to answer the question definitively.

https://discussions.apple.com/thread/6489683?start=0&tstart=0

https://support.apple.com/en-us/HT202724

https://support.apple.com/en-us/HT201287

http://help.apple.com/iphone/9/#/iph01ac18d71

Many thanks.