What is the max amount of simultaneous connections for Firestore?

Question

I know that the max number of simultaneous connections for Firebase's real-time database is ~100,000, but what about for Firestore?

For example, how many users could actively listen for document changes on a document? What is the "comfortable" limit for this (not just the theoretical max)?

Answer 1

See Quotas and Limits from the Cloud Firestore docs. That is and will remain the authoritative answer. Currently (during beta), 1M concurrent connections is the limit, but the number may/will change once it reaches general availability.