Hello, apologies for the leave of absence. I had to attend some family and health issues, and had no opportunity or time aside from that, to offer the usual support for Google Sheets For Unity. I will be slowly catching up and get back to you with some help.
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There are indeed concurrency limits when accepting requests, you can check more details regarding quotas and limitations here: https://developers.google.com/apps-script/guides/services/quotas
However, I would tend to think that for your use case, you should be within safe bounds. Thanks again for your patience.