As you have guessed there is some degree of variability here. The specs of the server where the player is deployed will have some impact but the most impactful item on performance and scale is generally length of transaction. I have seen installs where players had upwards of 50 transactions running on them with the average playback time being about 30 seconds or so. So player performance is mostly a balance between length and number of transactions. If most of your transactions are short and sweet you can squeeze quite a bit out of a single player.
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