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I don't remember exactly, but something like 450 inputs & 450 outputs. I think there's a standardness limit of 0.1 MB per transaction (it messes with mining transaction selection algorithm if larger). I don't think BIP110 has any changes in regards to coinjoin.
Some Wasabi coinjoin coordinators limit the size of the coinjoin transaction to 500 inputs because the chances more participants are, higher the chances that one fail and ruin the whole process.