Copilot 365 limit in data elaboration - Sentiment analysis

Hi,
I am working  on Sentiment Analysis on verbatims, elaborating in Word a Natural Language tables.
However, being a very complex system and receiving so many responses from so many touchpoints, we have noticed that Copilot cannot analyse beyond a certain number lines (apparently, 50 or 60 max)

Do you know whether this is a limitation set by our system administrator or a limitation of Copilot itself? Some hints \ similar experiment in this area? Thanks!